Upgrading a GTX 670

[borderdeal]

Thanks again for the replies guys. I am mainly looking to play the GTA, Fallout 4 and Star Wars Battlefront. I'd like to play Dragon Age Inquisition as well without getting frame rate drops now and again too.
There is a Sapphire R9 390 available for $489 and that sounds like the best deal at the moment. My only concern is whether it will fit in my case or not. My antec 300 two case says it has a maximum of 318mm graphics card space and the Sapphire is 308mm so I'm not sure if thats too close. What do you think?

If your case says it can take 318 and the Card is only 308 then it should be fine. I have a Sapphire 290 Tri-x and it barely fit my case but it fit by like 3 mm but it is fine