Here's a really nice system from monarchcomputers i put together for you. The site is a bit confusing but they have great prices and can build it for you. Building it yourself could take a day or 2 or more if you run into problems, but yes building it yourself would save a little money. You have a decent budget so try out these guys, they only use quality parts. The forum techies here can add or change anything to this as necessary:
-Logitech Media Keyboard PS/2 (967415-0403 $20.00
-Logitech MX518 Optical Mouse (Black) (931352-0403) $39.00
-Creative Labs SBS 5.1 560 Speaker RT 6W per sat/5" Subwoofer Black (51MF4005AA001) 1 $59.00
-Monarch Nemesis Custom Desktop w/PCI-E 1 $59.00
-Case: 100998 - No PS - Antec Performance One P180 ATX Mi $119.00
-Power Supply: 100242 - PS 550W - Antec True Power 2 SLI ATX 12V $145.00
-Motherboard: 110481 - MSI K8N Neo4 Platinum SLI Audio/GB-LAN/PC $170.00
-Processor: 120262 - AMD Athlon 64 4000+ 1MB 90nm Rev. E San D $369.00
-Memory: 140226 - DDR (400) 3200 - 2 GB (2 pcs 1GB) OCZ Dual Channel $259.00
-Hard Drive: 150322 - SATA - Seagate (ST3250823AS) Barracuda 250GB $125.00
-2nd Hard Drive: 150239 - SATA - Western Digital (WD740GD) 74 GB/10 $175.00 $175.00
-CD-ROM/DVD-ROM/CD-RW: 160324 - DVD-ROM - Sony DDU1615 16X DVD-ROM $37.00
CD-RW/DVD-RW: 160014 - DVD±RW - Lite-On SOHW-1693 16x8x16x-DVD-R $59.00
-CD-RW Software: 210613 - Ahead Nero 6.3 Suite DVD+-RW -Software (OE $6.99
-Floppy Drive: 170110 - Mitsumi 1.44 MB 3.5" Floppy Drive (Black) $20.00
-Video Card: 190416 - eVGA GeForce 7800 GTX 256MB DDR3/PCI-E/VI $490.00
-Operating System: 210111 - Microsoft Windows XP Professional w/Servi $150.00
-Warranty: 800099 - 6 months - Parts & Labor - Barebone (No S
Hot Rush: None - Standard Order ( ships within 8-13 business Half Life 2 Promotion: 27F854 - FREE Half Life 2 Full Version Coupon
Subtotal for 80502 with your selected options: $2,183.99
Order Total: $2,301.99
with the above i included everything except a monitor. you could go with less expensive ram if not overclocking.
https://www.monarchcomputer.com/Merchant2/merchant.mv