Well firstly let me ask what games do you currently play? Also are you running a multiple display setup?
Reason I ask is two 580's are still in my opinion quite overkill in most scenario's. The new graphic cards will probably start showing up Q'2 I would think of this year I know there is a article showing this somewhere I'll try and find it. Yea I'm looking around people are saying no sooner then March. And also the same from the AMD camp.