The processor installed,
the graphics card that you want.
In shopping, there is one from BestBuy for ~580 US$.
You should be able to build one for the price range you listed or at least mod a store bought one to fit.
One that would rival or out-perform an xps 630, my xps 630 keeps making loud noises, so I'm wanting to get a refund for it, and I would prefer not to build my own computer.