Question:

I currently have a ATI 7850 as my current GPU. I see the new r9 series have come out, at the pricey cost of roughly 400~ for one of the "better" models like the R9 280x.

I was wondering if it'd rather be worth getting the R9 280x or simiply another 7850 to run in crossfire with. I'm assuming if I got the 7850 and run it in crossfire, by the time I can't really play games on ultra anymore it'd be time to upgrade and the R9 series will already be much lower than what it is now. But is CrossFire worth it? I'm mainly considering that option since I have a triple monitor setup now.