Tahoe wrote:
Also; the overall build quality feels much better then the A4000T, 4000T's have a tendency to burn off the power supply connector to the mainboard...
It's because of the crappy power supply that Escom used. Replace it with a better AT power supply and the burning P8/P9 connectors issue would be totally gone.

Downsides to the 3000T are lack of AGA and the usage of highly sought after (ie: expensive) ZIPP memory modules. And possibly the lack of an IDE interface; although in my 4000T i don't use it at all.
A4000T comes with a better SCSI controller too. Its performance equals to any other top rated DMA SCSI-II controller available for Amiga, which means 10MB/s theoretical speed limit. The A3000's and A3000T's SCSI controller can push maybe as much as 4MB/s, with all the custom chips upgraded to the maximum revision level (DMAC 4, RAMSEY 7, WD-SCSI 8, Buster 11...although Buster revision shouldn't really matter too much as far as SCSI is conserned).
It's also cool that A4000T uses standard AT power supplies, so once your PSU fails it's easy to replace it with another AT or even better an ATX PSU (through an AT to ATX converter cable).
Built in flicker fixer is cool with A3000T, but just get a Picasso IV and stick it in your A4000T and there you go. :-)