I really love my A4000's (yeah sorry I have two

)
Its all about the Zorro slots, think of it as an A1200 with more potential.
I have two setups as mentioned, one with PicassoIV, Tocatta SoundCard and Buddha IDE (for the DVDRW) It has an Apollo 4040 (40mhz 040) with 128mb Ram, its in the Desktop case still and is probably my favourite Amiga, even over my A1200 PPC's. The next upgrade to this machine will be a Deneb

The other is a project that wasn't meant to be, but sort of came together out of spares, I picked up a cheap case (Elbox Power Tower) and Motherboard which was going to replace my other which had some faults due to battery leakage however it got repaired and I kept both.
The Elbox Tower has an A3640 overclocked to 33mhz, Cybervision 64/3D + Scan Doubler, X-Surf LAN Card, Z3 Fastlane + 128mb and has lots of space for further upgrades, I have a faulty CSPPC that I'm hoping to get fixed and will go in this build although its not looking good

As I say I love my 4000's however finding a good one at a decent price can be tricky and when you do there's a good chance it'll have battery leakage, even minor leakage can be fatal to the board, so getting that repaired is essential.
Good luck in your search if you do decide to get one.
Steve.