Firstly, thank you to you all for your replies - I really appreciate it!
Clearly, it seems that the best option is to stick with my i7-930 which is what I will do
Bearing in mind I am a bit of a novice at this, the first problem I can see is to do with the cooling. I have looked at the hyper 212+ and the H60, and it seems that these have to have a backplate fitted to the back of the motherboard in order for them to fit to the motherboard. I took the right hand side of the case off to see if I have access to the rear motherboard, but I dont, as there is a massive silver plate thing in the way.
So in order to fit one of the above mentioned coolers, I think I would have to disconnect everything from the motherboard, take the motherboard out, mount the plate, and then put everything back in, which I think is going to be a bit too much for me.
I have no idea, but are there any air coolers available that dont require a backplate to be fitted and just fit in the same Intel stock cooler holes, and are still good for mild overclocking?
If I was to go down the overclock route, I am not after anything big...something like 3.4-3.6Ghz would be fine.
Looking at the RAM, I can see that at the moment, I have four 2GB sticks, so I would upgrade the RAM to 12GB using three sticks. I think the RAM sticks I will have to go for is DDR3-1600.
Just out of interest, should I replace my current RAM to overlock my CPU to around 3.4-3.6GHz, or would it be OK to stick with what I currently have?
Mega thanks to everyone in advance!