Just in case anyone else needs info (I searched this thread recently to see what others were doing), here is a combo that is working well for us:
Intel BOXDG45ID LGA 775 Intel G45 Micro ATX Intel Motherboard
Intel Core 2 Duo E7400 Wolfdale 2.8GHz LGA 775 65W Dual-Core Processor
EVGA 512-P3-N871-AR GeForce 9800 GTX+ 512MB 256-bit GDDR3 PCI Express 2.0
CORSAIR 4GB (2 x 2GB)
Pioneer DVD drive (for installing)
Generic Sata HDD
XP
The case was a recycled rackmount computer we gutted. All from Newegg.com, total cost (not including XP, HDD or case) was about $520.
No dropped frames, looks great. We also use the same box as the server for BMD’s Videohub. I think the 9800 was key.
Monitor we got from B&H – an ASUS 25″ 1920×1200 for under $290 (Model number was something like 466H).
Ultrascope did NOT the smaller monitor (1650 x something) we tried (just because we could). Wouldn’t even launch.
Hope this helps another user.
– Bruce Colgate