I have 1 simple question for you. Do you plan on overclocking this desktop like crazy or no? If not, then id suggest you go with the standard heatsink fan that they have available.
Also forgot to ask, how soon are you looking to buy this computer? Reason I ask is because they are giving away some rather sweet games with the purchase of either an AMD or nVidia card. Just figured id point that out to ya.
Well I tried to help you out, esp w/ the price limit, but the video card would be a big issue. The fact that you want a good size monitor would be the biggest issue of it all. I would suggest waiting Black Friday (if you live in America) for a great deal on a good size monitor. Once you get that taken care of, purchasing the rest of the desktop off that site will be alot simpler.
I hope this info has helped u out.