Take out Win7 and you'll be able to get keyboard and mouse for the same or less money.
Asus makes good products, I like them quite a bit...
Corsair's SSD's are great, you think you won't need the speed, but you will be playing games from your SSD right? In that case, your save times and loading screen times will be significantly less with the Corsair Force GT.
If you can save more money on the RAM, do it, no sense in spending top dollar for RAM as long as you get something reputable. (Unless you're going to OC it, but on Intel that makes no sense)
The 1000W Platinum PSU is on sale and costs roughly what a gold rated 850W PSU does right now...it's a bargain, and the efficiency will payoff over a bronze/silver/gold rated model.
If you switch out the Asus board for your UD3 board you can save yourself some more money.
If you switch out the GTX 780 for a HD 7970 GHz you can come in about $200 under budget.
EDIT: Here:
PCPartPicker part list:
http://pcpartpicker.com/p/1issi
Price breakdown by merchant: http://pcpartpicker.com/p/1issi/by_merchant/
Benchmarks: http://pcpartpicker.com/p/1issi/benchmarks/
CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor ($189.99 @ Microcenter)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.98 @ Outlet PC)
Motherboard: Asus P8Z77-M PRO Micro ATX LGA1155 Motherboard ($139.99 @ Newegg)
Memory: Crucial Ballistix Sport XT 8GB (2 x 4GB) DDR3-1600 Memory ($54.99 @ Newegg)
Storage: Corsair Force Series GT 120GB 2.5" Solid State Disk ($129.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($59.99 @ NCIX US)
Video Card: Asus Radeon HD 7970 GHz Edition 3GB Video Card ($484.98 @ Newegg)
Case: BitFenix Shinobi ATX Mid Tower Case ($69.58 @ Newegg)
Power Supply: XFX ProSeries 1000W 80 PLUS Platinum Certified ATX12V / EPS12V Power Supply ($169.99 @ NCIX US)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($16.99 @ Newegg)
Monitor: Samsung S22C150N 21.5" Monitor ($109.99 @ Newegg)
Keyboard: Ducky DK1087XM Wired Standard Keyboard ($57.00 @ Mechanical Keyboards)
Mouse: Raptor Gaming M3 DKT Wired Optical Mouse ($17.55 @ Amazon)
Total: $1531.01
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-07-19 17:24 EDT-0400)