Depends on your budget. For about $120-130 USD, you can replace your dead GPU with a GTX 750Ti or R7 260X. Both not only offer you a 2-tier upgrade on Tom's hierarchy chart (http://www.tomshardware.com/reviews/gaming-graphics-card-review,3107-7.html), but also offer you a quick upgrade without having to worry about your PSU.
Assuming your PSU can handle it, you might want to even consider going up another few levels to a GTX 960, R9 270/270X, or even R9 280. The only issue might be on the PSU, both for the amount of power they need (GTX 960 recommends 450W, R9 280 recommends 500W) and for the PCIe power connectors (although if your PSU doesn't have them, you can get Molex-to-PCIe adapter plugs). However, much more beyond either card & you'll need a new PSU.
Now, when I said it depends on your budget, realize that you must replace your GPU. A PC with a dead GPU is like a PC with a dead CPU/motherboard/hard drive: a very expensive paperweight. However, you still have a very good CPU -- 3rd-tier on Tom's chart (http://www.tomshardware.com/reviews/gaming-cpu-review-overclock,3106-5.html). The only way to get a 2-tier jump (& essentially give you a tier-1 CPU) would be to switch over to Intel. However, without any current Broadwell chips announced for LGA 1150 boards, and Skylake set to come out within the year, I would be hesitant to do an Intel switch at this point when you might find yourself at as much of a "dead end" as the AM3/AM3+ sockets from AMD. Not to mention the hassle & time you'd have to spend reinstalling Windows due to the motherboard switch. Best bet is to replace your GPU (& maybe your PSU, if you want an even better GPU), & save your money for future upgrades.
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