$200-250 upgrade

[Zen_]

Currently running a 6870 that isn't quite enough for medium / high detail in GW2, particularly WvW, and a 2500k @ 4.5 GHz

SAPPHIRE 100354OCL Radeon HD 7870 GHz Edition 2GB ...
PowerColor PCS+ AX7870 2GBD5-2DHPPV3E Radeon HD 78...
Galaxy 66NPH7DV6XXZ GeForce GTX 660 Ti 2GB 192-bit...
MSI N660TI-2GD5/OC GeForce GTX 660 Ti 2GB 192-bit ...

Despite my AMD fanyboy tendany, I am leaning towards the Galaxy 660 Ti because of it's excellent efficiency compared to the Tahiti LE card, and because it has a blower style heatsink to help more heat out of my case.

I just want the absolute most bang for my buck under $250.

 

[DarkOCean]

have you seen this? ZOTAC ZT-60901-10M GeForce GTX 660 2GB 192-bit GDD...

These SAPPHIRE 100354OCL Radeon HD 7870 GHz Edition 2GB ...
and MSI N660TI-2GD5/OC GeForce GTX 660 Ti 2GB 192-bit ... are also not bad.
Avoid the blower type cooler on 660/70/ti's those are more noisy and hotter than the 1-2-3 fans alternatives.

 

[Jack1n]

PowerColor AX7950 3GBD5-2DHV4 Radeon HD 7950 Boost...
25$ above your budge,but worth every penny.