For the most part, you probobly don't need a better processessor, let alone a top of the line one.
I really think people trust in the all mighty clock speed waay too much. I'm not saying that clock speed is invalid, but recently its become less and less of an indicator of a computers actual speed.
I have what I call "The Tank". Its an Athlon 750 w/512megs of ram. For its time, it was a damn fine top of the line computer.
Even up to this last summer I never felt the need for more, like older computers in the past.
The only reason I got a new computer was that I needed a laptop for school and work. I got a pIV 2.2 ghz w/512megs of ram.
Really there isn't a whole lot of a difference, and despite my laptop's clock is 3x The Tanks, its not much faster.
I'm sure if you push the envelope, you'll see some difference, but I use both and I always have 2-8 apps open, usually a dvd playing in the background, 15 windows all over the place, etc. I don't notice any problems on either.
I still don't have video games or DVDs slow down on my 750...
In my personal opinion I think that RAM is much more important, followed by the dedicated hard drive for your swap file (a fast hard drive).
Loading the kernal into RAM sounds interesting, but it also sounds like you'd need A LOT of RAM for that... well RAM is cheap now