Bit of a tough for someone on a forum to help, its a "need to be there to see" situation, unless someone doesnt mind typing the bible out to try and help

Also chris, dont get that PSU if you do get one, its an own brand so although it says 600 odd watt its probably not very efficient and the amps wont be very strong(even though it might say they are)
Get something like this http://www.ebuyer.com/UK/product/106366/rb/0 or http://www.ebuyer.com/UK/product/114931
Both 10 times better than the value one you looked at, i know it costs more but a good psu is very important, if this fails it can take your WHOLE pc down with it!