A-Data is REALLY good belive it or not. i can run my 2 512mb sticks at DDR2 977 4-4-4-12 when ther only supposed to be DDR2800 5-5-5-18. and the price is even cheaper then corsair too and they look way better than anything ive seen appearance wise
hmmm okay, so their products are good, i know that, but have you heard about their PC4000 Ballistix (2x1GB) sets dying after a couple months? I would rather be safe with Samsung UCCC for 2x1GB DDR sticks.
I think corsair is the best (though I couldn't afford it). I also like g skill, patriot (have to look for good stuff, though), PQI, and OCZ are pretty good. (and are really the only brands I would ever buy.)