PREFERRED WEBSITE(S) FOR PARTS: I generally use new egg, but I'm open to others if prices are better.
COUNTRY OF ORIGIN: USofA
PARTS PREFERENCES: I've had bad experience with Radeon's in the past, and have been using nvidia for my last 3 or so cards, but I have heard that Radeon isn't so bad ... so if the performance distance is drastically higher for similar pricing i'd be happy to make the move.
OVERCLOCKING: Maybe, I'm fine with doing it, if it gets me enough more band. SLI OR CROSSFIRE: My prefernce would be to buy something that I can SLI or Crossfire with in the future instead of buying 2 lower end cards now.
MONITOR RESOLUTION: 1920x1080. Though something that can perform higher is preferred as it is my intention to upgrade monitor in the not too distant future as well.
ADDITIONAL COMMENTS: This is step one in an overhaul, I decided to upgrade my GPU first because I have another computer that is missing a GPU that I can toss this one into, as a back up for the time being while I upgrade all the various parts in this one. I'm looking to spend between 250 and 350 dollars, though around 300 is my preference.
In that price range, you can grab a GTX 480 (which on average, performs better than all those cards listed.) The problem with the 480 is it can run hot and sort-of loud (people say, i never hear mine though.) If those are dealbreakers, though, the cards that you listed are good cards, and very similar in price/performance.
EDIT: Sorry OP, I will give you Pros and cons so you could see the details pretty much
+ Superior performance than 570 and 7850
+ Very stable and mature driver as it is kinda old (2-3 years if I am not wrong)
+ Cheaper than 570 and 7850 (very good pure price/performance)
+ Great to SLI
- Older tech (You still got DX11 to play with though)
- High Power consumption
- Runs pretty Hot 80C is pretty common with this card
560 Ti 448
+ Trade blows with 7850 (but obviously not the 480)
+ Stable and mature driver just like 480 (I really, really rarely see someone having 560 Ti 448 with issues)
+ Great to SLI too
+ Cooler, Lower power consumption (compared to 480)
- A bit of older tech (compared to the 7850)
- Still not cooler and lower power consumption compared to the 7850
- Most expensive of the pack
+ Newer tech
+ Consumes least power of the pack
+ Runs coolest of the pack
+ Same performance than 560 Ti 448 although it is losing from the 480
+ Overclock really great (I saw them getting OC'd to 1050 Mhz easy (190Mhz increase) without much effort)
+- Priced right in the middle
+- Good to crossfire, but drivers can be buggy when crossfiring.
- Doesn't perform as well as 480
-- Buggy driver (maybe because it's new, but many people have issues)