Since you're only running at 1680x1050 I would recommend either a 5770 or 4890 depending on how cheap you can find them. If you really want to step up, go for the 5850 - but it might be overkill for your resolution by a bit.
Yeah I could buy the 5850 and I do have the money for it but then I would have to buy another power supply at least 500 w I beleave When it comes to the 5770 I really have doubts, it seems like a ok card but then I would have to replace it in a year, so now my choice would be the 5850 and please tell me that I´m right about the power supply?
You are right. There is basically no way that 460w power-supply is going to run a HD5850, along with the rest of your new parts. If it were me, I wouldn't even be putting those new parts in with a 460w power-supply. You can get something in the 600, 650, 700 watt power range for very cheap now.
True, the 5770 will likely need to be upgraded within the next year or two. At this point the best 'price for performance' cards are the 4870/5770, 4890, GTX260 and 5850. I see hardly any reason to even consider anything but these(if you're on a budget).
A 4890 will get the job done for you and more, but keep in mind it lacks the DX11 support - which I don't think is a big deal personally.
Ok peeps, thanks alot for your replies Now I understand this a little better, the ATI 5770 is not a good card or maybe it´s good if you compare it with medium and low cards but I dont think it will last the year so I´m gonna buy the ATI 5850. That card look like a beast.
Excuse me? Its not possible to run Fallout 3 or Crysis Maxed out on the 5770? Hmm you could have fooled me as I've played both at max settings on my 5770 and never dipped below 40 FPS at 1080p resolution which is around the 1680x1050 mark. You take benchmarks too literally. Outdated in a year? Every piece of new technology is out-dated in a year. I bought my 4850 about 1 year ago exactly and its outdated already. If you have the cash get 2 x 5770s and run at 5870 speed then you don't have any worries about being "out-dated" in a year. heh.
If you want to max out every single game at 1680x1050 with 16xAA then it won't happen, many games are poorly optimized. While Crysis is godly optimized it still takes a lot of hardware.
A 5770 will play most games at high with 2-8xAA.