Ok, I used the specs listed by you and built your system in the cart on newegg. I even included some things you didnt list (power supply, case), and I used a $300 24" monitor and it came to only $1120. This was the AMD build.
With this build here, you could drop $100 by using a 22" monitor with 1900 x 1080 support. The zerotherm nirvana is expensive at $50 and really isnt all that great, you can save $30 here by switching that for a Arctic Cooling Freezer 7 Pro. Drop one of the 640gb harddrives in exchange for a single 1TB drive to save another $60.
Just those simple susgestions there cut $200 off the final price, and you havnt really lost anything. You can use this money saved to upgrade the video card, as I mentioned about a 4830 wont be able to handle modern games at 1900 x 1080 with decent performance without sacrificing all visuals.