Good early selection with your psu! - giving you a bit of gfx choice headroom at this stage.
Like the others said, you don't want to be bottlenecked by your cpu or held back by your monitor resolution. What you can get with only changing the gfx card is a big improvement in gameplay so, with a little help from tom's, and parting of cash, we're pretty much focusing on this page (from the latest roundup i.e. newest/current cards):
Well I am switching over to intel later this year (maybe sometime this summer or fall) and I have the funds to get a new GPU that will last me a few years instead of just getting a low/mid range one again.
So should I just wait until then to get a new graphics card, or go ahead and get one now?
The cards suggested by us above are more upper mid to low high range and should all be perfectly ok for another 2 years. However, if you wait, prices should fall and new opportunities may appear (but you don't get gameplay boost right now ).
If you want to buy now for your current and a future system you may be asked to list the main components of your new system before best advice is given e.g. a gtx670 is well regarded as an excellent high end choice for a gaming board (not so much cuda).