I was hired to do my first wedding gig. Unfortunately, gear is limited since I'm still pretty new to this. I have a Canon Rebel XT, and I think I need a better flash than the one on the body. However, money is also limited. So, with that, can anyone suggest a good external flash in the $150 or less range that will work well with weddings and portraits? Or is $150 not even enough for it to be worth it? I may be able to go up. I just don't want to blow my entire paycheck from this gig on a single flash when I don't even use flash all that much.