I've recently become interested in this amp and I've read the threads as well as listened to the clips. Some people prefer the 60 and some the 90 which doesn't surprise me since I'm sure they are both great amps. Could anyone describe the differenced in tone between the two? The cleans, slightly broken up, crunch and high gain tones? I'm sure the 90 has more clean headroom, but I'm looking for tone comparisons. Right now I would lean towards the 90 based on Brian Kahanek's clips. Maybe I'd feel the same about the 60 if thats what he was playing? Thanks!