Upgrading from a HD 4850?

[j.col]

also agree on the 6850 or if in budget the 6870

[Pob255]

the gtx260 was about level pegging with the 4870, the gtx275 was battling the 4890 if I remember correctly.

And the non-ti gtx560 which is neck and neck to the 6870 also cost around £150, the gtx560ti is faster but costs more.

(my gtx260 216core is still doing sterling service on my 1650x1080 monitor)