A4000T of course! You can run everything on it, and expand it like hell. It's design has also had a few improvements. For example ports, including video are in separate daughter cards wich you can replace later. The sound is also better, I can get a 14 calibration file without any beeps, but for some stupid reason the level is way too low on my system...(recently made a thread here about that).
And it also has scsi2 built in, though most accelerator cards include decent scsi anyway.
