BJ, that should be a very good camera for your needs, but as noted, if you're going to really get into gig photography in a serious manner, you will end up wanting more. Much more.
I just ordered an upgrade from my Canon Digital Rebel XT, the new Digi Rebel XTi, but I do it as work, so I can write it off my taxes
Also, RE: megapixels, it's true to a point that it doesn't matter over 5-6MP. It only really matters if you plan on making prints larger than 8x10 or if you're hoping to do anything intensive digitally a la Photoshop. A 10MP is more than enough for what I see you working on; that is, taking gig shots for reviews and online use. The low light situation with gigs is a trick. If you're looking for some nice work, check out Kirstin Marvic's work over at where you can find some really nice gig work. She's gotten it down to its artform, playing with the low light.
It's nearly impossible to shoot gigs, from experience, without going manual on settings, because flash is the bane of existence for any venue smaller than a theater (not only do most artists hate it while playing, but you end up with completely unbalanced lit shot), and it's utterly useless for anything bigger than a theater; conclusion: flash sucks.
In any case, this should suit your needs, so go for it and have fun.
