$2000 should get you a lot of computer. Even though it looks like you will need a monitor also. Well it will get you a lot at Cyberpower and Ibuypower even though if you buy from them you really need to research your parts for compatability.
Also do not skimp out on the power supply as it is the heart of your system
Get a good named reliable 80+
You can go to those sites do a soft build and post it here and ask for critique on it.
That would help make sure you end up with a system you really are happy with.
Also do not use anything branded xtreme gear or cyberpower or raidmax from them
The power supplys they make will lead to a head ache down the road.