What is the best set up for eyefinity?

[Legosteeltwist]

Looking to build a new computer and I know pretty much all the parts BUT the GPU. So I'm asking what's the best set up? Should I wait and see what the R9 290x has to offer or 2 7970's/a 7990? Just asking for some input.

 

[cooldex]

what for the R9-290x cause hd 7990 powerful but alot of issues and 7970 cf is good but same thing and both will beat the R9-290x but older hardware and r9-290x will use some new api's and other new stuff future proofing you and lower wattage, more efficient and cf two r9-290x later on down the road that will be better then 2 7970 its unknown if it can beat two 7990's