I have a mesa express 5:50 2x12. It is an intensely versitle amp; blues, jazz, pop, rock, grunge, all possible, though it lacks a little in the gain department (it sounds ace, but there just isn't as much as I would have liked: I'm getting some new tubes from 'doog' for more gain/slightly tighter bottom end). For Kurts sound, all you need is:
fender guitar with humbuckers in it
fenderish clean/slight break up clean channel
boss DS-2 and ehx small clone
If you buy a mesa, please let it be for any other reason than wanting to sound like someone who really didnt care what he sounded like. a fender hot rod deville and pedal can do the job at half the price