All I can say is stay away from the ASUS 4870. They seem to have faulty fans. My 2nd one just died after RMA'ing the 1st one. The card still works but the fan stopped working. About to post the 2nd one off which is quite irritating to say the least.
I still like ati though, and would rather stay with them than go over to nvidia, it just looks like asus messed up. At the time I bought the card it was the best bang for my buck and I do so like rooting for the underdog.

