Need a Mobo for my first gaming Rig. (SLI and AMD FX-8120 Ready)

Hello there, I've been thinking about creating my first PC for a long time.
This PC is for gaming, but I won't be doing any hardcore gaming, and Anything above 40FPS is fine with me.
I'll be playing the likes of BF3, Crysis 3 when released, GTA IV with ENB mods and Diablo 3 which doesn't require much power any way.

My budget is some where around £500.
I'm from the UK by the way, so I'll be using UK links for this.

Here is a list of the parts I am currently considering.
AMD FX-8120 - http://compare.ebay.co.uk/like/200756465894?var=lv&ltyp... (£127) (I don't want to spend more than £150 on a CPU)

EVGA GTX 570 1.28GB - http://www.novatech.co.uk/products/components/nvidiagef... (£199) ( Don't want to spend more than £200 on a card).

RAM - http://www.amazon.co.uk/Skill-Ripjaws-F3-10666CL9S-4GBR... (£18) (I already have 4GB ripjaws lying around my house).

Hard Drive: 2TB for around £70 from a friend.

CASE: CM Storm Enforcer - http://www.amazon.co.uk/gp/product/B004S9S218/ref=s9_si... (£60)

PSU: Bought a Corsair 800W PSU from a friend for £40.

MOTHER BOARD: Here's where I need your help, I need something that can handle all of the above, while also providing SLI support for TWO GTX 570's in the future, the budget is £100).


That's about it really, for now.
I'm not going to be overclocking any of this equipment, as it is more than enough for me at this current state.
I'm also not going to be installing an after market CPU cooler, unless the FX8120 overheats while not OC'd, will this happen? As I have heard unsure reviews about it.

Thanks for having a look at this guys, any recommendations are welcome!