Should I crossfire my 4850 or just go for a brand new 6950/6970?

[dw96]

Yo all, here's the deal - I've got a ATi Radeon HD 4850, quite good, but it's kind of giving me a headache when it comes to running newer games - 15-20 frames on GTA IV with high settings doesn't sound good to me...

So the deal is - do I crossfire my current 4850 with another one or do I just buy a new GPU, like a 6950 or a 6970? It's a tough decision to make - just to note - it's not really about the money here, it's just that I'm not 100% sure if the 6000 series is right for me.

P.S.: Yes, I absolutely MUST get 2GB of GPU memory if I will be going for a new one.(this question is also in the forum: http://www.groovypost.com/forum/hardware-software/crossfire-vs-new-card-t97008.html)

[Guest pumpkinskin]

Keep things simple. Buy a new card and sell the old one. Done and done.

That being said, I really don't understand what all this means.