I don't plan to use this rig much, it's mainly for the (hopeless) technical challenge. That and I have a few parts lying around including the HD3850, N520, case and the mentioned Physx card. The PPU will be useful if only to benchmark with 3D Vantage (the second Physx test supports addon cards).
Once completed I think I'll give it to a relative or something, don't have much use for a third backup rig.
CRUNCHERS - 1090t - 2x1055t - X4 620
OCTANUX - Conroe865PE - QX6800 - 4GB DDR-400 - HD4670 AGP - Audigy 2 ZS - Physx PPU
phenomenal - AM2NF3-VSTA - 965BE - 8GB DDR2-1066 - HD3850 AGP - X-Fi - Physx PPU *WIP*
Green Tea - 939A8X-M - FX60 - 4GB DDR-500 - 7950GT AGP
Re-build - CT-6VTA2 - PIII 600E - 384MB PC133 - Voodoo 5500 AGP - SB16 ISA
RB scraps - IC7-G - P4 3.4E - 4GB DDR500 - HD2600XT AGP - X-Fi - iRAM *WIP*