It seems I have confused things abit with the example i gave, I have no interest in overclocking this computer it just needs to be reliable and quite quick, after watching that video it seems a better example would be the standard i5-2500 and i7-2600 bot the unlocked K ones.
I am planning to built a new computer in the next month or so and have been looking over all the information on intels new sandy bridge based processors. I am stuck between whether to spend extra on the cpu, say getting the i7 branded 2600K over the i5 - 2500K, or getting a mid range graphics...
Thats not a proper car install. Have a look at some of these are proper car installs. Especially this one, which is over 10 years old and can still pump over 156db with 12 18" subs.