I recommend Ubuntu when people ask because it has the most support.
I boot into text mode then startx into just plain OpenBox where I added tint2 for a task tray. The whole footprint is < 200 meg and I've got 16 gig RAM WOOHOO!
The thing is, Linux will use all the unused RAM on your computer for disc cache. So on this machine instead of a smaller SD drive I went with a 2 TB regular drive and all that RAM. By the time I've accessed anything once it's in cache and never has to hit the drive.
I swear I'm not being weird or old about it. I thought compiz had too many bugs and just set up OpenBox for something and really couldn't think of a reason that I needed anything else. I think desktops on Linux, OSX, and Windows all three are crazy bloated from the old competition they used to have. I go into openbox with like four things running, (network manager, bluetooth, power manager, and dropbox). What else do I need going on? Seems nothing.