Yep. I don't trust any system I or some specific people I know didn't build. I'm still using a three year old system that hasn't had a gaming hiccup yet. Some people don't believe me when I say it runs Crysis turned up to the nines... but most of those people have it installed on slow hard drives...
Specs:
*Proc: AMD Athlon 64 X2, two 2.41GHz cores.
*Mb: MSI K9N Neo-F
*Vid: NVIDIA 7950GT, 1GB (BFGTech)
*PhysX: BFGTech128
*PS: Tagan TG420
*RAM: 2GB, 800MHz (Crucial)
*System/gaming HDD: 74GB Western Digital Raptor 10000RPM SATAII (and wishing it was a *SATAIII. That's still my systems's biggest bottleneck)
*Storage HDDs: 500GB 7200RPM, 1TB 7200RPM and 1.5TB 7200RPM, all SATAI... because they were cheap.
*Case--: Antec nine hundred.
*Monitor: 19" 4:3 aspect LCD. Made by Envision. It was cheap, and it works fine.
*Sound: Bose 5.1 system hooked to the HDAudio ports on my motherboard.
*Mouse: Logitech, optical, two buttons and a wheel. I've had it far longer than the system it's hooked up to, and it served me well in Europe and the Middle East with no noticeable performance degradation
*Keyboard: Belkin, pretty standard, had it as long as the mouse.