The Antec Smart Power is not as good of quality as Antecs TruePower line of PSU's.
I value my PC, and choose to only run quality clean power supplies with mine,
but the lower line Antecs should work, I just would not choose them.
True enough. The smart power is their bottom line. I know a lot of people will disagree, since there are some issues arising from the lower amperages on the 5v and 3.3v Rails, but I really like the NeoHE line as well. I use a NeoHE 550, and it works great. 3 12V rails, modular cables (a great feature that all psus should have, quiet, stable, and uses less electricity). Just don't use it on an ASUS SLI board.
In my humble opinion based on years of computer service and custom builds, Fortron power supplies are probably the best lower cost power supplies. Up from there I like Enermax, and recently Seasonic has impressed.
My advice is simple: Brand dame power supply, Antec, thermaltake whatever. Get a good warranty. All the other crap doesnt really matter. I have been using a 240 watt generic PSU with my PIII 800 for ages, Ive opened it up, some of the resistors are partially melted, most of its covered in dust but my system is still perfectly stable. Ill spend the whole $60AUD to replace it with a thermaltake PSU when if/it breaks, then use that PSU in my next build.