I'm going to build my friend a comp pretty soon, and I want to use the inwin L545 slim matx chassis. It comes with a 180W psu (Power Man LPS-1806DV-20 180W) and I can't find it anywhere without a psu included. I'm going to put in an msi 6390L (km266) mobo, xp1800+, 256mb ddr, cd burner, seagate cuda IV hd (7200rpm), and a firewire card. do you think that 180w psu could possibly be enough to guarantee stable operation all the time?