If you're wanting to use that RAM I think you need to go AMD. Get a 770 chipset motherboard or higher. ($70~ish) and then however much of a processor you can pay for. Seems like even a Phenom II 955 wouldn't be out of reach.
Cases are very preference based. I just started looking at the possibility of upgrading a case myself and all the ones I seem to like most are from cooler master.
Sorry your budget is pretty tight, but I'm still trying to figure out some other stuff cause you needs a good amount of things still, I'm going to be updating this post soon, I just have to go somewhere right now.
Okay so these are the parts I found and I know its a little odd the parts, but it would work great for what you need it and I tried to make it in your budget, but it was very hard. If you have questions just ask and if you didn't need some of the parts I posted just tell me and I can take the extra money and put it towards some of the other parts.
Usually PSU's that come with cases are terrible. I had a friend have nothing but problems with his computer with one of those PSUs. Now that motherboard is back in my hands and is acting as my server. It runs fine 24/7.
He also actually listened to me this past time and his system is rock solid.
Wow thanks man thats lucks great. Ive manage to just get a DVD/RW for free so I dont need that anymore, and my budjet has just gone up to around £400. Could I get a crossfire mother board for that bit extra? or how would you change it for a bujet of £400?
This one has AMD chipset and is £20 quid less than the one you posted. Whats the diffence please? http://www.overclockers.co.uk/showproduct.php?prodid=MB...
Thank you so much for your help btw, Im defo no longer buying of ebay and getting from this site now you have shown it me. Have you ever used it?