Asus P5Q SE Plus (subtract another $15 MIR)$80
Sapphire HD 4670 512MiB or $120
for Asus HD 4830 (subtract a further $20 MIR)
Then you should have about $40-60 for a new PSU. Try these:$40
Antec Earthwatts 430W$60
Corsair 400CX 400W (further $20 MIR)$69
Corsair 450VX 450W (further $10 MIR)$60
OCZ StealthXStream 500W (further $35 MIR)
... and others from FSP, SilverStone, Seasonic, PC Power and Cooling, etc.
The Model M is not for the faint of heart. You either like them or hate them.
Gerbils unite! Fold for UnitedGerbilNation, team 2630.