Thermaltake makes very good PSUs now. You should never under power your computer though. Aspire is garbage.
I know someone or have used all the posted PSU's above. Aspire was the worst. Antec, Thermaltake, and OCZ are excellent.
OCZ is best out of them.
I currently have a thermaltake 420w and it runs @ 12.1V idle and 12.03 @ full load - so I'd say its pretty good and it only cost $30 w/ shipping.
It only needs 20 amps but they reccommend what you posted.