Ughmahedhurtz is right. for 1k it won't be easie to get a good build. If you need monitor also, it will be even tougher.

Something like this can run skyrim with 1080p medium => high settings with like 2AA. Can't really run it with ultra settings.

http://www.amazon.com/CyberpowerPC-G...1416991&sr=8-9

and skyrim is really easy on the system spec. Try something like witcher 2, you will really see your system slow down.