SLI or Crossfire: Yes but not necessarily right away.
Monitor Resolution: 1920x1080, but might go as high as system is comfortable at later but I don't really go crazy over higher resolutions.
Additional Comments: Bit terrified of cocking this up. Looking for something good to play FPS (BF3) and MMO/RTS with settings cranked up but doesn't have to be amazing, more important games run smoothly and everything loads fast. Also considering plugging it into my HDTV , willing to pay alot of money but don't want to pay through the nose for something that I'm really not gonna notice. Noise and effciency are concerns of mine. so far i have ..
Get the asrock z68 extreme3 gen3, 2x4 (8gb) of low profile 1600mhz ram with voltage 1.65v or less (less is better). A 650-750watt psu will be fine.
For what you need the cooler to do get the Xigmatek Aegir.
I don't think you should spend ~£40 on only 4GB of RAM. Seeing as you can get 8GB for a similar price. You should also change it because Sandy Bridge CPUs prefer to work with RAM with voltages below 1.6V (the one you listed specified 1.7V).
Corsair Vengeance LP 8GB (2x4GB) DDR3 1600MHz CAS9 1.5V CML8GX3M2A1600C9B £34 http://www.cclonline.com/product/63462/CML8GX3M2A1600C9...
Another board I would consider is the Asus P8Z68-V (£137) http://www.cclonline.com/product/58768/90-MIBGC0-G0AAY0...
I believe it is comparable functionally. However it has two less SATA ports, I also don't know if the Asus board has any equivalent of the Gigabyte DualBios system.
The Asus board is better in that it has more fan connectors, apparently the Intel gigabit LAN the Asus board has is better than the Realtek one on the Gigabye board (this is probably academic). It being cheaper is the main advantage.
The choice of cases and CPU coolers should also be better at other sites like ebuyer, aria, scan, etc.
Cogage True Spirit £26 http://www.scan.co.uk/products/cogage-true-spirit-48x-a...
This is probably the best cooler below £30. You could go for the Hyper 212 Plus/Evo if you don't mind having a cooler with a fan that can spin at 2000RPM (which wouldn't meet my requirements for being quiet).
Some large and roomy cases:
Corsair Carbide 400R, 500R, Obsidian 650D, Graphite 600T.
Cooler Master HAF 922 or 932 Advanced or even X. ATCS 840. CM Storm Trooper (if it comes into stock by the time you buy)
Antec 1200 V3, DF-85, P193 V3. 1100 or P280 (if they come into stock by the time you buy)
Fractal Design Arc Midi, Define XL.
Silverstone Raven RV02
Akasa Venom Toxic/Strike
Thanks for the advice guys I appriciate it especially the info on why you picked the parts you did. Certainly dodged a bullet with the voltages on the ram. I actually already had the NZXT Haviks in mind for cooling and I already use ebuyer so that should make it easier.
really excited about putting this together now, again thanks for your help