SSD improves general desktop performance and game/map loading that is stored there. It does not affect general gaming performance
Well to get SLI/Crossfire you should look at the H87 boards, though I would recommend a Z87 board anyway, since it isn't much more, but then you might as well get the overclocking CPU.
$1300 Canadian with crossfire 280x might be a bit much to ask, you really would have to sacrifice either the drives, or go AMD on the CPU and motherboard.
$1392 with an OS and a basic case.
PCPartPicker part list:
http://ca.pcpartpicker.com/p/24sma
Price breakdown by merchant: http://ca.pcpartpicker.com/p/24sma/by_merchant/
Benchmarks: http://ca.pcpartpicker.com/p/24sma/benchmarks/
CPU: Intel Core i5-4670K 3.4GHz Quad-Core Processor ($239.75 @ Vuugo)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($28.79 @ DirectCanada)
Motherboard: Gigabyte GA-Z87-HD3 ATX LGA1150 Motherboard ($110.00 @ Vuugo)
Memory: G.Skill Sniper Series 8GB (2 x 4GB) DDR3-1866 Memory ($85.99 @ Memory Express)
Storage: Seagate Barracuda 2TB 3.5" 7200RPM Internal Hard Drive ($89.79 @ DirectCanada)
Video Card: Gigabyte Radeon R9 280X 3GB Video Card (2-Way CrossFire) ($299.99 @ NCIX)
Video Card: Gigabyte Radeon R9 280X 3GB Video Card (2-Way CrossFire) ($299.99 @ NCIX)
Case: BitFenix Merc Alpha (Black) ATX Mid Tower Case ($42.99 @ Canada Computers)
Power Supply: Antec HCG M 850W 80+ Bronze Certified Semi-Modular ATX Power Supply ($79.99 @ NCIX)
Optical Drive: LG GH24NS95 DVD/CD Writer ($17.00 @ Vuugo)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) ($97.99 @ NCIX)
Total: $1392.27
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-11-18 17:42 EST-0500)