Electrolux Wavetouch -- we got them and they are fabulous, quiet, and have a very large capacity. And they come in colors... Billy

I have a 27"- 28"ish wide closet for our Bosch (it's 23.5"). It was as wide as we could go. My only recommendation is that you confirm where the plug is on the stack unit you get before you do any electrical. Fiance wanted the plug low and now the cord is too short to plug in and getting the unit into place is really hard. You may want to give yourself a bit more room than we did. It will save you a lot of hassle. Many of the units by Bosch and Miele are only 24" to 26" wide, you would have to be more concerned about depth and door swing on a front loader. Even those fairly cheap stack able Thin Twins by Whirlpool/Kenmore/Maytag (whatever) are often 24" to 27" wide but then vary on depth. They are frequently "full size" ore close to it. I just caution you against making the same mistake we did with electrical. We did not make the mistake with plumbing though. Make sure you put your hookups in a accessible place. We already needed to turn our water off when one of the hoses got knocked off when we put the unit it place (the Bosch tech did it even). We were sure glad that those hook ups were on the side instead of the back. Much easier in a tight spot. It was worth the cost to move that small amount of plumbing. Good Luck!

The biggest problem you may or may not have is the construction of your home. There is always going to be some vibration from a stacked set, much less a regular side by side. If everything is very solid, you are probably ok but if the structure is at all bouncy it will translate into the walls and be loud. There are any number of things you can do, and there are any number of options for washers but the structure will be the limiting factor.

limited space means you need to tell what the width/depth/hight requirements are. Most units will be 27" wide. Depth may vary and may also depend on front or top load (front needs more space for the door to swing open). Also, how high can you reach? I have an LG pair stacked but I'm 6' so reaching for the top dryer controls is not an issue. Budget also needs to be known. My pair was around $1700 all told.