The main thing to consider is the height of your faucet. As long as the prep faucet moves side-to-side, you should be able to get things in and out of the sink easily, but you may not be able to wash or fill larger pots and pans. I chose a lavatory sink and lav faucet for my prep sink. I did this for aesthetic reasons. Everyone tried to discourage me on the sink size, placement, and my choice of faucet. I took lots of time to consider how the sink would be used, the biggest thing I might want to wash, etc. The only problems that I encountered is that lav (and prep sinks) have smaller drains. This meant that I couldn't use a regular strainer basket. Of course the prep faucets may not have sprayer features, but who cares?!!!? If you like the faucet combo you've selected, I can't think of a reason not to go for it. After all, it's YOUR kitchen. (By the way, I have a high-end Delta faucet in an unusual bronze. It did not come with a drain or air gap for the dishwasher. Don't know what color your is, but buying the matching accesories for those two items was exorbitant. Good luck!

Either same faucet different finishes (I'd never have answered that was if I'd not have seen the lovely kitchen above) or same finish, no need to match. What would look bad would be two different finishes and styles in the same kitchen. My faucets (I have three) are all different, all within six feet of each other...and the only thing they have in common is the same finish. They look great and each functions as it should for the area it serves.

I don't like Corian. My sinks don't feel like plastic or corian. Yes, it is a composite material, but I'm not sure somebody would walk up to it and say "ooouuhhgg it's composite." They look metallically, silvery gray and wear like iron. If your mindset is that composite equals fake, then they aren't for you. Frankly, sometimes composite materials are better, IMHO, than natural. YMMV. And this is coming from someone who makes the huge majority of her food from scratch with organic and locally-sourced ingredients so natural matters to me. My cabinets were made by Cornerstone Cabinetry, a one-man shop in Buckley. His quote equaled or was better price wise and included much more than quotes I received elsewhere for semi-custom cabinets. My cabs were made without fillers and included end panels without extra charge. I received personal attention, hand holding, and patience with last minute changes as the cabs were being made that I doubt you'd receive from a big box store or many other places. After experiencing a custom shop and products, I can't believe I would have been happy with anything else.

We have the water filter at the main sink. Not only is it closer to the glasses; it's closer to the espresso machine and tea things and to the baking center. That's convenient for making bread dough. We also find other advantages to having it at the main sink. Ours is instant hot water as well as cool. When cleaning just a pot or two, it is convenient to add some hot water from it to the tap water to get warm water for washing instead of waiting for the hot tap water to arrive (and it saves water). Someone who needs water doesn't have to disturb someone using the prep sink. For example, getting rice started while someone else preps for a stir fry.