I recently got my 4890 CFX up and running, love the performance and ability to turn up max details! Yet I still desire a little more out of my games. Would it be worth it to sell the 4890s and get a 5850 CFX or gtx460 sli setup now? I know the ati 6xxx series is supposed to come out towards end of this year sometime. So I'm wondering if it'd be better to upgrade now or wait for next gen of cards to come out?