You can get a pretty good PC for $1500. The only problem with "off the shelf" stuff is they generally use cheaper products on their builds and also include a lot of bloatware.
For just a little more than that ($400), I built my gaming/DAW machine last june......I got a fairly good graphics card (for gaming) + a new monitor which boosted up the price to about $1900. The good thing about putting a PC together is YOU get to choose all the (quality) parts that YOU want, and not settle for a standardized unit with inferior parts.
Of course, if you don't like to put it together, you can always contact Jim Roseberry or Scott from ADK and see what they can do for your budget. You'll have a peace of mind that it's done properly AND suited to your needs.