I am building a system MSI MS-6526-GL-L, Celeron 1.7GHz 478-pin, 256ddr, Maxtor 81GB UDMA133 7200rpm, DVD. I need a small case, the MB is a MicroATX and all the MicroATX cases I see are 180w. Is this enough power for the system I'm building? I usually build XP systems and run 350w minimum power...