I am a Sapphire HD 6770 user. I'm pretty much happy with it. What are you planning to subject it with anyway? It's pretty much a mid-end graphics card. Good value and performance too.
I have purchased most of my build, just need the GPU and mobo. Would be pairing the GPU with this harware:
CPU is an i5 2300 2.8GHz (Was on sale for $170 otherwise would have gone with the 2400)
8GB of G.SILL Ripjaws 1333MHz
Biostar TZ68A+ Motherboard
Seagate 320GB barracuda 7200RPM HDD (salvaged from current PC)