I would say you might want to wait.  It's really on the edge.

How much longer do you reckon?

For a 650?  No way.  Not really on the edge.  A 680 is slow but serviceable, I can run the benchmark with 15-20 fps and a medium map runs fairly smooth at 2560x1440.  A 650 has about a third of the horse power, you're going to be doing 10 fps, maybe better and maybe worse, but you'll never get anywhere near 30 on that thing.

You can, however, buy a 970, and have good performance in dx12 with the rest of your rig as is.

The 600 series is well-served technically and dollar-wise by an upgrade to 970 or better. Of course, everyone has their budget and monetary priorities. Otherwise, your platform does just fine. This game's going to be driven by the GPU. That's where you budget needs to be focused. Good luck and join the fun!

Is there a particular reason you want a mini version? If not you could get something like http://www.scan.co.uk/products/4gb-gigabyte-gtx-960-windforce-2x-oc-pcie-30-(x16)-7010mhz-gddr5-gpu-1216mhz-boost-1279mhz-cores-102 which is a few quid cheaper and be a little bit faster with the over clock.

You are right tatsu, I would not overclock a card either, you only ever get a couple of fps extra but may shorten the cards life very significantly. I do tend to think factory OC ones are safer than doing it yourself (A bunch of people I know are using factory OC'd Gigabyte cards and they are doing fine) and just wanted to offer alternatives as I think a premium is paid for a mini card and if your case is a normal size then it is not needed. A non-overclocked one would also be fine.

Zorin1, I would wait if I were you. The new cards coming should be very significantly better. And if they are a touch on the pricey side they might push better cards into your budget range. TBH I also think the 960 is not a great card and a 660ti can limp along a bit longer

Hey Brad, what graphics card should I get if I want 60 FPS on minimum?