I want to get one of those flashes that can be set up as a speed light. I really don't want to go into the store not knowing what I'm talking about. Are there any other alternatives to the Canon ones? What features should I look for? I basically want something I can either hold in my hand for weird flash angles, or set up on a tripod or something when doing portrait stuff? I looked at the Canon site and found that you can set two or three up at once which would be cool too..? I'm looking for something that works on my Canon Rebel 300D. Thanks.