I run my system on an xtech 350Watt smps. Now I want to change my graphics card from 6600gt to 7900gt. This smps I have supplies only 12A on the 12V rail, it seems. The nvidia site asks me to get a 500-600W smps with 30A on the 12V rail, while a review site (anandtech or pcstats?) says 20A on the 12V rail is enough. So I guess any smps with either 20A or 30A should be ok. Now, I don't want to spend >8k for an smps, nor do I want to totally skimp on it. I heard zebronics smps is better than the other skanks. Are there any other less-dear-than-antec-but-still-better kind of smpses around? And, I guess that nvidia says 500-600W on an Antec-level smps. How does it translate to the other compaies we will be talking about? Also, according to my apc UPS, I use only about 214W at idle and about 260-280W on load. My ups has an upper limit of 300W (at least, that's how far the power progress bar extends). Probably, I will need a new UPS as well?