I was planning to build a new PC later this year, might as well do it now, using Radeon cards this time.
I'd love to use 2-3 6990s but they are out of stock, so I'll aim for 1 GH/s instead of 2.
I know.. every card I look for is sold out everywhere. I hope its not all bitcoin miners buying them all because the difficulty is going to go through the roof.
I'm building a mining rig now.. I already had a pretty decent gaming PC but with an Nvidia card so I am not even going to try mining with that. Plus its got way too much CPU and hard drives I don't want to burn up. It seems like purpose built miners where you downclock everything but the GPU to save watts is the way to go.