Hi Matt,
The TT030 has been known not to run all Atari game related software, but its a damned good system. STE based software out there is specific for the STE, same with Falcon030 software, some of the packages released were specific to those ST's.
Yes, the 7800 Dev software runs fine on the TT030, I have it on my system and it runs perfectly.
The TT's were originally intended to run Atari's Unix V System 4 operating system to go head to head with Sun and HP in the Unix market, but Atari changed its strategy and adjusted the system to be TOS compatible. If you can get a TT030 with an Ajax floppy controller it will read/write 1.44mb floppies. Some TT's that were returned for service had their VME controller chips removed and were downgraded to 16mhz due to hardware issue's early on.
If you pick up a nice 19" monitor from B&C or Best you can take advantage of its hi-res mode or look on the web, there is a new VME graphics card with built-in ethernet port on it, the drivers for the ethernet port haven't been written yet, but the 24bit color graphics card can do 1024X768 (or higher I think...) the price is a bit heafty: $249, but worth it if you use a replacement desktop like Jinnee with MiNT and then you can use Calamus, CAB and other really great software and you find yourself with a great alternative system to a normal PeeCee....
Here's some more info:
http://www.atari-his...bits/tt030.html
Curt