Looking to replace my current board with one more suited to overclocking as I want to hopefully unlock a core on my X3 720BE and find a clock speed that is somewhat better than standard 
What boards in the OCUK range are better for what I want than others? Ideally, I wouldn't want to go much over £100 as I'll need to buy some new DDR3 RAM as well. I'm a bit confused by the differences between the chipsets, I assume the 8xx series ones are better but what differentiates them?
Any help, greatly appreciated!

What boards in the OCUK range are better for what I want than others? Ideally, I wouldn't want to go much over £100 as I'll need to buy some new DDR3 RAM as well. I'm a bit confused by the differences between the chipsets, I assume the 8xx series ones are better but what differentiates them?
Any help, greatly appreciated!