Id get the Sapphire 5770 over the HIS 4870, it is $5 more but it has DX11 for futureproofing, more power efficient ect. The performance is a little lower with the 5770 but that will be recouped with driver updates.
One is a older 4xxx series 4870 which will outperform the 5770 by about 10% in DX9/10.
The other is a newer generation 5xxx series 5770 which supports DX11. The other advantage of the 5770 is power consumption savings which while it might only save you $5 a year, it will keep your case inside a bit cooler. Also if your PSU is already close to it's limit, it will put less load on your PSU
Ah, okay My bad. I was confused on the ones I linked
I'm kind of inclined to go with the XFX card now, warranties are always a huge plus! And I don't know too much about cooling, but it sounds good. I appreciate your help!!
What about the juniper xt version of the card? It seems almost the same, but it says it comes with a crossfireX bridge. The reviews on that one scare me a little though... Only slightly. I have a feeling its just people who don't know what they're doing enough to fix any bugs or problems they might have.