Hi GH, All of that water demand will, most likely require a 3/4" water line, instead of the standard 1/2" water line, be piped to the shower to deliver additional volume and pressure. Without that, you will not have good performance from using multiple sprays, regardless of the valve type or diverter option. And yes, the volume is cut in half with shared functions from a diverter, but depending on the shower heads, may still be adequate. It's a balancing act, and will depend on your water pressure from the street. For a standard 1/2" diverter, to just switch between functions, the Delta R11000 rough-in body is reasonable and good quality. Then you choose the type of trim option and a 6 function cartridge. Otherwise, if 3/4" water line is at the shower, separate volume controls will allow all the functions to flow at full blast.

Some people love them, some don't. I've had people lump them into the whirlpool tub category. Where they use them everyday for the first week. Then once a week for the next month. Then they only remember they are there when company comes over. Personally I don't particularly care for them. My wife doesn't like them either. We like our 12" rainhead and our regular head, but chose to omit body sprays in our own master shower. If you do consider sprays you may have to increase the size of the shower drain. I'd reference your local code during the planning stage to prevent any surprises during construction.

: ... really? "stupid 1.6 gal toilets". Aren't we talking 15 year old code. You'd think people would be over that... DH (watching the game): Ahh. Life is good. DW: HONEY. The kids plugged the toilet. AGAIN. DH: sigh. The game is... DW: PLUNGE IT - NOW! The kids are late for soccer. DH: But... DW: NOW! DH: stupid &*(#@#$&*) government mandated &*()&*%^&^%( toilets.. DH: Wheres the plunger? DW: I put it in the garage. It didn't look...pretty. TV: That was one of the greatest plays in football history! Watch this replay! DH: Stupid &*()#&*() government mandated &*()^(%^%^* toilets... Gov't mandated 1.6 gal toilet: splush. splush. urk. blech. DH: Ok, its done. TV: Wasn't that great? Now some words from our sponsors... DH: &(*)&*^&^% next time &*()&*(&^&^ Al Bundy Mighty Ferguson U*OP*&&*^&*^%^%$ : ... I am building a high end custom home and would not do body sprays. I know that I would use them once and then conclude that they are a terrible waste of water... (Next week. Overheard at the high end custom home next door): DH: Gosh this game is good. Hey honey, come check out the 1080p on my new big screen! DW: Here is some fresh popcorn and a cold one. DH: Oh baby. Come snuggle with me. (game continues) DH+DW: (crunch, crunch, snuggle, snuggle) DH: How 'bout we take a nice post game shower together. DW: Mmmm.... DH: Maybe I'll even turn on the body sprays and get us nice and steamy... DW: Purr....fect... DH: BTW, did you hear about the couple down the street? D*** was watching the game last week. And right in the middle of it he had to plunge the kids toilet. Missed the best play I've seen since Howard Cosell was announcing. DW: I sure am glad we paid the extra $1500 for those fancy toilets that actually work. DH: Yeah. Its too bad that when the government bowed to the pressure groups, the Japanese held the 'good' patents. So the American manufacturers ended up losing about 10000 good paying jobs as a result...

"I'll need to investigate water flow/pressure though. We're on a well with a pump and I'm not happy with the pressure as is but what can I do?" Shower heads are rated for a maximum flow of 2.5gpm, 2.0gpm, or even 1.8gpm, usually at 80psi. If you're on a well, most well set-ups have a pressure regulator with a factory set PSI range. 40psi-60psi is common. Some others are 30-50, some 50-70. The pressure regulator, as well as a water dial pressure gauge, should be located at the base of your water tank. The regulator itself looks something like this and the regulator and water pressure dial indicator assembly could look like this. For a 40-60 rating, it means that when the house pressure drops to 40psi, the regulator switch will energize the well pump and water will be pumped from the well into the holding tank. When the pressure hits 60psi the well pump will be de-energized. As water is consumed and the pressure drops, the well will cycle on and off as needed. Too low water pressure (20 psi for example) can result in anemic flow. Too high of a pressure (above 100psi for example) can result in water hammer, or seal or cartridge leaks in your valves or faucets. You can turn on a faucet, get the water flowing, and watch the needle movement on the water pressure gauge to see the PSI settings where your regulator and well pump are cutting in and cutting out. Your plumber can adjust the regulator if needed to change the line pressure. It's not difficult. Most single shower head bathrooms are plumbed with 1/2" supply tubing to the shower valve. Talk it over with your plumber, during the reno if you have undersized tubing feeding your bathroom, you may be able to upsize it to 3/4" depending on access. That written, unless you have something unconventional in your plumbing....an excessively long run, or a lot of elbows in the plumbing...two standard shower heads can simultaneously be fed with a 1/2" supply tubing from the bathroom branch running to the 1/2" supply valves for your shower heads. Your plumber will be able to guide you through any pump pressure and supply tubing size issues.