I agree, you are not getting an Intel on that budget. I also assume you meant the i5 750?
You also have to factor in Windows OS (as you did not state whether you had it) for $99.99 so that even blows Bant's suggestion off budget.
In additional comments you state a 20 inch monitor...are you needing a monitor or is that what you have? If you need one, then between that and the OS you are going to end up with about $500 for the actual computer.