I've got two A1200 towers, but I still ended up going back to the Big Box Amigas (first an A3000 and then the A2000) because I wanted the classic look and feel of an original machine and still have easy expansion options.
A couple of months back I decided to leap in and get an A4000D just to have the AGA chipset too. I pulled the internal SDFF from one of the A1200Ts, an extra RAM card and Cybervision64/3D from the A2000 and added a new Deneb and FastATA4000. I think I now have my ideal classic Amiga and I plan to sell the others off as soon as I can get a few weeks of peace and quiet at home to list them on eBay.
If you have a chance of an A4000D then I'd say "go for it!". :-D
