I know it's not strictly one amp but I love my G-Dec 3 Thirty. I like the way it has all the amp models on it and more settings than you can shake a stick at while remaining incredibly easy to use. Being able to play along with the in-built backing tracks and any that you wish to add makes this a brilliant piece of kit. All this in a great sounding cabinet!

I'll keep an eye on this thread though and may be tempted to try some other dedicated amps out.