Hi, I am on the verge of ordering the canon xti with grip, but I am wondering if the 3 frames per second are fast enough for sport photography which I wish to get into. Mainly surf photos and MMA/Boxing? I am too scared to buy a used 20d on ebay/CL, so I want to buy new. I know the build isn't the greatest on the xti, I've had my rebel 2000 for 7 years and it's still good as new. What do you think?