Though you didn't mention the processor you use and preference for overclocking, here is the list I've made for you:-
> EVGA Z68 SLI Motherboard (Intel Z68 Socket 1155) 130-SB-E685-KR
> AMD BIOSTAR MOTHERBOARD TA990FXE AM3+ AM3 8 CORE USB 3.0 DDR3 990FX CROSFIRE SLI
> MSI Z97-G45 Gaming LGA 1150 Intel Z97 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard
> ASUS Z87-PRO (V EDITION) LGA 1150 Intel Z87 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard
Graphics Cards: GTX 750 will fit your budget.
My Suggestion: Think twice before you install SLI. It will consume more power and produce a lot of heat. So, you need to afford a better Power Supply Unit as well. I recommend you to buy a strong graphics card so that you do not need to worry about power supply. Also, SLI's performance is so similar to a strong one.
Go with R9 270X or R9 280X, if you want AMD based Cards.
Otherwise,
Go with GTX 760 or GTX 770 TI, if you love NVidia.