Hi there Kevin, Welcome to Amiga.org!
It all depends what you want and how much you want to pay?
If you don't (at this stage) want to splash out several 100 dollars/pounds/euros on a new AmigaOne then I'd recommend an A1200 with an acellerator card and Hard Disc, that will get you back onto the road to amigaville, and from that basic set-up, you can re-aquaint yourself with the amiga world, and fiddle and up grade it etc. while you wait for the AmigaOne to a)come down in price a bit and b) for AmigaOS 4 to be released.
Well.... thats what i'm doing anyway.... ;-)
-Jar.