I have a Canon Rebel Xt now and until I get better/can afford to step up the body (way down the line) I was thinking of making some changes. I have a Canon Rebel Eos 35mm camera I wanted to sell (never used once I got my Dslr). And I wanted to get this lens http://www.tamron.com/lenses/prod/55200mm.asp What do you think, is it worth it. The Xt came with a 17-55 lenses, this fits perfectly, I have a 70-300 zoom lens but was thinking of selling it too cause I just dont use it, and im not happy with the pictures from fullest zoom because I shake it too much (no monopod). Am I thinking in the right direction here? Thanks in advance.