A couple of things, first please try to forgo the excessive exclamations - it makes it sound like you're shouting. Second, yes that is an excellent processor but look for the i7 980x, it's similar in price and far outperforms the 975.
As far as getting either of those CPUs into you current computer, that's completely impossible. As stated earlier, they have different sockets (pin layouts), so you would need a new motherboard and ram for sure. You also might need to replace several other components, like the power supply. The i7 980x is socket LGA 1366. Check on newegg for these type of motherboards and start from there. You're more or less looking at a completely new system. What is it you intend to do with this system? Start with picking out components that all work together. As for overclocking, I would only recommend that AFTER you have built your own computer.