The best idea for graphics would probably be the HD5770. It offers plenty of power for a 1920x setup and will last you a year or two easily. Its also lighter on the wallet and power bill.
I dont agree with Integral on the case part. Dont cheap out on your case. You dont need anything ultra-expensive, but a good case will provide your components good airflow, keeping temperatures down and life expectancy up. It will also likely be better designed and quieter. Lian Li makes some good cases if you're willing to shell out a bit of a premium, otherwise take a look at the Antec 300 and 900 v2. I have an Antec 1200 which I got on sale, a sale you shouldnt expect to see. Its essentially a bigger version of the 900 and provides great airflow, is quiet and easily fits the masses of hardware I have in there.
As for monitors, if you dont mind the lower quality of a TN panel, the ASUS VK2x6H series are excellent value. I have the 26" VK266H which looks pretty good. A pair of them should be about 500 USD on Amazon. (Dont buy monitors from Newegg, Amazon has a much better return and exchange policy)
Again, pick out your monitor and case well. A good case can last through multiple pc's, same goes for monitors.
Like Integral said, you can save some serious cash if you look for deals. For example. My case costs about 250$ right now on Newegg, I got it on sale for 75$. Two GTX 260's cost me 250$ total, where each one, even now, is about 150$, and back when I bought them, they were 270$.
CPU and Motherboard are often in combo deals on newegg that can save you 10-15% off the price of the two individually. As for RAM, if you don't forsee upgrading past 8GB anytime soon, I suggest going with 4x2GB modules, it will be cheaper than a pair of 4GB modules. Make sure all 4 are the same version, speed and timings, to reduce the chance of them not working together.
