Directron did have a nice Enermax that was OOS the last time I checked. Compgeeks has had a few Arrow 300W units but they show low stock right now - gotta hurry if you want it. They also have Powmax 230W... As far as quality, you got me... The Athenatech case I have has a HighPower 230W in it that I can vouch for the build quality on - it weighs nearly as much as my Sparkle 250W ATX PSU (the good one, FSP...) but I've not found a place to buy them separately. Be sure the mobo you use has a P4 connector (4-pin square) to power the CPU and anything 200W and up should do fine as the SFX PSUs seem to be a bit sterner than their ATX brethren.
.bh.
:sun: