hi! i currently have a canon xti body, 17-40mm 4.0L and 70-300mm lenses. i'm a beginner but but i have a pretty solid technical knowledge. i like to shoot music and concert photography mostly indoors in dark rooms, with lighting that isn't so great. i'm quickly realizing that my current set up just isn't going to cut it... most of the time i find i cant get enough light, the images aren't clear, or the noise and grain are just out of control. it seems everyone else can effortlessly get great shots, and i'm struggling just to have options. which brings me to.... considering an upgrade to a better camera body, or maybe buying another lens? (thinking about 1.4 50mm) i'm looking for advice from anyone willing! i've talked to the guys at b&h and calumet in nyc but it always seems like they are trying to push things on me. (which is how i ended up with the two lenses i have). of course price is a consideration, but i'd like to make smarter choices in purchasing/trading in equipment so i can really start to get creative when shooting shows. if anyone has recommendations i'd love to hear them. thanks so much!