Welcome to Bleeping,
I agree with the legoman on this one. Nvidia and ATI are in the battle royal'el right now and we get the benefits.
I run the ASUS's AX800PRO TVD AGP 256MB and love every second of my extreme graphics but the ASUS 6800 Ultra Platinum 256MB is just as awesome!
I will tell you this, I have gotten better service from ATI then Nvidia. Also, I have have gotten better service from ASUS then Crucial.
Crucial is a spin-off of Micron which started strong ending in shame. Try to claim your lifetime Micron warranty from Crucial. You will see.
These are the companies I would buy a video card from: ASUS, Abit, and for the everyday computer Sapphire. Abit comes from others recommending. BFG makes good stuff but I have run into weird issues using their cards. They do have an outstanding customer service though.
Your favor...as the legoman says,
Your Hardware Guide.