If I upgrade
 

Since my "loud sound dibocle," I've been thinking a lot about upgrading my mobo to an Intel compatible with a new proc like an E6600. I'm not worried about moving all my parts around in my case, only if I have to fool with the BIOS. Would I have to do this, or would it just recognize the new parts and boot up like normal?

Well whatever Mobo you buy should come with a CD, if you install the CD correctly then you shouldn't have to mess with anything in the BIOS.

That's great news.

BTW, when would I ever HAVE TO open up the BIOS and tweak things? I don't ever OC so that's out.

You may have to tweak the BIOS for stuff like boot sequence and various other things, but that would usually be a one time occurrence.

But why E6600 when E6750 is cheaper and faster

I just pulled that core out of my head, yeah I will go for some other E core, probably the E6850.

I still cannot figure out why the E6750 and the E6850 are so relatively inexpensive as compared to the other E series processor. They have the exact same caches, same core frequency, and a faster FSB speed. It's still a good deal, but has anyone discovered why they are less?

Chances are that they're either significantly cheaper to make, or Intel dropped the prices to make their new products more competitive against AMD's increasingly cheaper products.

You mean like the two hundred and sixty dollar single die quad?