I could care less what price the AMD products are priced at regardless, or what their overall frame rate performance is, be it better or worse than a competing Nvidia card, they are built with terrible parts and QC standards compared to Nvidia are shoddy. The only year in the last decade or so where you could say ATI/AMD was on par with Nvidia was probably the year of the GTX 4 series cards Nvidia released which still shockingly had better RMA/QC issues than their competitor........
The big problem for me with AMD is their software. Quite simply, it is not on nvidia's level, even to this day. Reading about experiences with the Mantle "beta" driver brings back a lot of memories of trying to get surround working properly with 7970CF, which was just a PITA. And even beta drivers should not be that annoying to bother with, because i've used beta drivers from numerous other companies and have never had one single issue. And their frame pacing. They basically skipped DX9 frame pacing with eyefinity, so don't bother playing Skyrim. I don't know how their DX11 eyefinity frame pacing fares, apparently their alpha driver has that feature included. Basically, the problem with AMD is "Beta" with AMD truly does mean either beta, or in the Mantle driver's case, "alpha++". The ATI Mantle thread at OCN has nearly 200 pages of people not being able to get it working well. Ridiculous. Even for "beta", I mean, "alpha++", the level of problems for a feature hyped to no end is absolutely ridiculous. And according to AMD, Mantle was in the works for 2 years, and the delay in December was due to DICE. I'm willing to bet the December delay wasn't due to DICE at all, but was in fact due to AMD. That's my problem with AMD right now, and I really wish they'd step it up in terms of software. Right now they're just not up to snuff in the software department. Period. To date, they're still being AMD of the old days in terms of software. That is NOT a good thing, and this is the CHIEF problem that AMD needs to fix. The best hardware in the world is 100% useless without great software to back it. The most promising new features are worthless without proper software to back it.
Anyway, regarding the topic at hand. Price / performance is not the best factor to focus on , because price/performance always favors the extremely low end; I mean if you want to take it that far, the HD4400 is the best price performance. Or a GTX650. Would I game on a GTX 650? At 1600? Nah. It isn't adequate for 1600p despite having good "price/performance".
The best thing to do is look at your total budget for a GPU and choose the best performance you can buy, with the features you want. If you have a 250$ budget, evaluate from there. 200$? Evaluate all 200$ cards and go from there. Focusing on "price/performance" is silly. The best price/performance will have you reaching for some 100$ GPU that isnt' even adequate for 1080p with high settings.