Up until now I haven't had to supply my own amp to play a gig, so my 15 watt practice amp has worked just fine at home. Now I'm going to be playing at church youth services and want to get something that will be versatile and reliable. I've not done any shopping whatsoever so I'm a complete newb to amp lingo. I want to be able to get any tone from aggressive to that soft "jazz" sound. I'm also wanting to spend less than $400 but I need enough juice to sound good in a gym (if that's possible). Any thoughts?