I see no issues at all with that system playing GW2, which I have bought as well, still can't get wow out of my system, even though I left it a year ago now.
That card, if I'm not mistaken is technically above mine which is a toxic version of the same, I have mine running at 985/1200, so there is more headroom there as well, plus you can o/c that processor to 4 easy enough.
If your trying to save on the cash outlay this should suffice.
Considering the costs differences for something like the 2500k and an equal asrock board, still quite the savings you made, but, if you can afford the 2500k and an equivalent asrock board, absolutely get them.
Sorry for the edits, was just looking at the site, was curious, for the $10 difference I would def grab this board.http://www.dabs.com/products/asrock-990fx-extreme3-am3--amd-990fx-ddr3-atx-7XNH.html?refs=48750000-50568&src=3