Yes a 7870 should easily be able to handle 2 monitors. I have a 7950 (7870 is only a step below it) and run 4 monitors. Running multiple monitors doesnt take a lot of work as far as the graphics card goes, unless you're trying to game on multiple monitors. For the price you're paying for the 7870, you might want to try to come up with an extra $50 and go with a 7950.
Thatnks for your reply. It's exaqctly what I was hoping for. I don't want to have to buy another GPU now if I can hep it. But I do want a 2560x1440p Koreaqn Monitor for my main gaming display and have normal programs that I would normally alt+taqb out to on the 23".