I still think 18 will work. I am going to try the PS that came with my case.. 18a. If not, then live and learn.
-DFI Lanparty NF4 Ultra-D
-AMD 64 3000 Winnie
-eVga 6600GT (PCIe)
-Mushkin Dual Pack PC3200 (512 X2)
-80gb WD SATA HDD
-Creative Live! Series 5.1 surround sound w/subwoofer