Colin:
A buddy of mine that I jam with now and then told me yesterday about a crate amp he just picked up. He got it new from Guitar Center for really cheap. He said he is amazed at the sound and he is now using it over his Fenders due to it's size and weight. Also, are you familiar with harmony-central.com? Their user reviews section is a great source of info. I ALWAYS check there before putting money down on new or used equipment. Do you really need 100 watts? Many players I know prefer less wattage. A 100 watt amp, especially a tube amp, will usually need to be cranked pretty loud to hit its sweet spot. Personally, I prefer less wattage. Invariably, if I'm in a situation where more power is needed, my amp will be miked and reinforced through the P.A., so more wattage isn't necessary.
Bill, tgo