Hello!
For retro gaming, I think you can't beat an A1200 with 68030 accelerator and a hard disk, and a copy of WHDLoad.
WHDLoad is an installer system that installs games onto your hard disk. The downside is that the installed games usually require a bit more RAM than they do running off floppy, but the accelerator I talked about above will have that.
The best part is that some games which worked on the (older) A500, but not on the A1200, are actually fixed by the WHDLoad installer.
Some links:
WHDLoad siteAmigaKit.com (you can buy brand new, or NOS amiga stuff from there and get full support and warrantee)
The best place to get Amiga gear is probably eBay. Search for an A1200, and try and get a Blizzard 1230 card (the best ones, IMHO). The A1200 can use a laptop style 2.5" hard disk (it has the mounting cradle for one inside), or you can actually squeeze a modern 3.5" IDE hard disk in there if you remove the cradle and squish the metal shielding carefully (it'll need a special cable, though).
