Well, I've been decking out my A4000D and it's coming along nicely. However, for my gaming and playing I use my A1200. I was using my A1000 until I got the A1200 and I'm waiting on AmigaKit.com to put an accelerator in my A1200.
I'm also slowly working on building up a good A500 but that's a longer term project.
The thing I really like about the A1200 is the ability to use almost all of the old software as well as some of the new. Also there are tons of upgrade options for the A1200 whether you live it in the desktop case or switch to a tower version.