What about the ati 4890? I just saw it for around 30 dollars more on newegg.
hey! you are here right while im typing lol. The 4890 is more powerful.
If you have a very large monitor the 4890 would give you better performance. If you just have a medium sized monitor I would personally go with the 5770 just because its newer, runs much cooler, Dx 11 etc etc.