I have an Asus Pundit P1-PH1 and want to upgrade the power supply. The current PS is 250w and would like to upgrade to a 300-350w. It's a P4, 24-pin mainboard, need molex, and SATA. I'm having some problems finding ones that will fit. The dimensions are 4.75"L x 4.75"W x 3"D (121mm x 121mm x 76mm). I can't go any bigger dimension wise for space reasons. Thanks in advance.