and what you talking about 150 watt? the only sff i know of antec making is the aria, which has a 300 watt ps.
unless you're talking about a minuet, in which case i dont know what it has.
if you are talking about a minuet, realize you'll be using half height cards and severely limiting your upgradability.
You need something to put that PSU in first... I think you're starting on th wrong end of the decision making tree here. Check out either the Shuttle SN45GV2 or the Biostart IDEQ 200N. Both are well-built, good performing Athlon SFFs.