Hey there. You are talking about 2 different things. GPU (the GTX 560 Ti) and CPU (the i5-2500) overclocking.
You cannot overclock the CPU, no matter what.
The GPU can be overclocked.
SOC edition cards come already overclocked from the factory. You can have the same card by buying the cheaper version and overclocking yourself.
However, I think we can change the build to allow for overclocking.
Look into the 2500k and a P67 or Z68 motherboard. Also, please fill out this form: http://www.tomshardware.com/forum/261222-31-build-advice
Gives us more info.
I'll check back later.