Taking low light photos

I'm not a beginner, but I'm not a full on pro either. I take a lot of pictures at bars and concerts. There are places where I can't take a professional camera, so my DSLR is out of the question half the time. I like to have lots of options and settings. I like the g12, because I can use my Canon flashes with it, and there seems to be a lot more fun things to do with it. Lenses and what not, but I'm wondering if that is actually worth it?