I've got evga 680i w/big typhoon. Fits perfectly, and it cools extremely well. The new VX doesn't have a mounting bracket, but i got the older one bc i hate the clips(similar to those on the the stock HSF).
Check this page out.
http://evga.com/community/messageboard/topic.asp?TOPIC_ID=21045&SearchTerms=tuniq,tower
I went with Thermaltake big typhoon. They have a new vx edition that that doesn't require backplate.