OK - just to demonstrate that its possible I put an idea together quickly, It totals $888. Personally I would spend more in some areas for high end parts, but the below already has a better processor and GPU than the dell idea.
Most users here think that these "build it for you" companies are a waste of money BUT if you are considering doing it half way -- this is much better than trying to do it with a Dell.
Configuration#: 1EBC9C (
http://www.cyberpowerpc.com/saved/1EBC9C)
Case: Thermaltake Commander Mid-Tower Gaming Case [-12] (Black Color)
CPU: Intel® Core™ i5-3470 3.20 GHz 6MB Intel Smart Cache LGA1155 [+80]
Motherboard: Biostar H61MH Intel H61 Chipset DDR3 mATX Mainboard w/ Onboard Video, HDMI, 7.1 HD Audio, GbLAN, USB 2.0,
Memory: 4GB (2GBx2) DDR3/1600MHz Dual Channel Memory (Corsair or Major Brand)
Video Card: AMD Radeon HD 7850 2GB 16X PCIe 3.0 Video Card [+226] (Major Brand Powered by AMD)
Power Supply Upgrade: 500 Watts - Corsair CX500 V2 80 Plus Certified Power Supply [+24]
Hard Drive: 500GB SATA-II 3.0Gb/s 16MB Cache 7200RPM HDD (Single Hard Drive)
I am not, however, vouching for Cyberpower as the best company to do this. I've bought one prebuilt from them, and it never broke down, but dont know if there are better companies out there.