upgrading gfx...your views?

[DragonWoLf]

So as spec in siggy, I'm currently using a 8800Gts 512mb dual screening, 1 being a 22inch and another a 19inch, I use 2 screens as I'm always doing several things at any one time, be it burning, gaming, watching something but anyways am looking to upgrade to either 4870x2 or the 295GTX's so I wouldn't have to upgrade till like end of the year or so..but yeah so been reading upon here and reading what peoples views are on both cards so I ask you now what does ye suggests??

 

[DragonWoLf]

dont think my mobo has another pci x16 slot for another card but its a sound plan hmmm, as for performance wise.. does lag a lil now playing Left4Dead and listenin to iTunes same time, the game slows down a lil but all else at the same time runs finee

 

[DragonWoLf]

aye its at stock still, and oh didnt know that gotta see on that then hmm about a 8400GS, would one still be able to use ultramon if I were to do that?