I don't know which speakers to get you.
PCPartPicker part list:
http://pcpartpicker.com/p/sGNr
Price breakdown by merchant: http://pcpartpicker.com/p/sGNr/by_merchant/
Benchmarks: http://pcpartpicker.com/p/sGNr/benchmarks/
CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor ($169.99 @ Microcenter)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.98 @ Amazon)
Motherboard: ASRock Z77 Extreme4 ATX LGA1155 Motherboard ($129.98 @ Outlet PC)
Memory: G.Skill Ares Series 8GB (2 x 4GB) DDR3-1600 Memory ($39.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($69.99 @ NCIX US)
Video Card: Asus Radeon HD 7770 GHz Edition 1GB Video Card ($147.55 @ Newegg)
Case: Antec Three Hundred Two ATX Mid Tower Case ($57.73 @ NCIX US)
Power Supply: Antec EarthWatts Green 650W 80 PLUS Bronze Certified ATX12V Power Supply ($68.99 @ SuperBiiz)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer ($17.89 @ Outlet PC)
Monitor: Asus VE228H 21.5" Monitor ($129.99 @ NCIX US)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) ($89.98 @ Outlet PC)
Keyboard: Lite-On SK-1788/BS Wired Standard Keyboard ($14.97 @ Newegg)
Mouse: V7 M30P10-7N Wired Optical Mouse ($5.13 @ Amazon)
Total: $972.16
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2012-12-15 22:09 EST-0500)