My vote is for the GSX. Stock GNX's are fast but they sound like sewing machines (OK, very fast sewing machines) when they race. I like the sound of a BBB thru a 2.5 or 3 inch exhaust.
Of course the fact that I own one doesn't mean anything.
I'm also a fan of "low tech" in that I can actually name all of the parts under the hood.
Brian