I have 1 and 2. I still like my 1 just fine. 2 is faster, but 1 is no slouch. My apps are stable on both. Both of mine are in identical cases and colors (black), and I often forget which one I'm using. I don't play games, though, and maybe there's a big difference between 1 and 2 when it comes to that; I wouldn't know.
I bought a second iPad because I wanted a backup while charging and synching. I would've been happy with a second iPad 1, but figured iPad 2 might get a generation or two more in firmware updates.
I bought my husband an iPad 1 on clearance, and he's happy with it.