Is this the best computer I can get with a $2000 budget?

Case: http://www.newegg.com/Product/Product.asp?item=N82E16811129021

HD: http://www.newegg.com/Product/Product.asp?item=N82E16822136073

GPU: http://www.newegg.com/Product/Product.asp?item=N82E16814130072

PSU: http://www.newegg.com/Product/Product.asp?item=N82E16817139002

Memory: http://www.newegg.com/Product/Product.asp?item=N82E16820148070

Motherboard: http://www.newegg.com/Product/Product.asp?item=N82E16813127030

CPU: http://www.newegg.com/Product/Product.asp?item=N82E16819115017

I would say:

Change motherboard to Gigabyte P35 DS3R
Drop down to a smaller hard drive (unless you need 500GB)
Change the tracers to standard Ballistix
Change to the HX520W, it should be plenty powerful
Get a cheaper case

How much do you want to spend on a monitor? The GTX can handle most monitors, but if you can only afford a small one, you'd better off saving money and getting a GTS instead, then spending savings on a larger monitor :)