Frizholy wrote in post #4148515
Right now I have a rebel xt with a 70-300 f4 IS telephoto lens and it seems a bit slow and not that great of quality. Which body would be the best upgrade if I want more fps and all around better camera for sports?
Frizholy,
When you ask a question like this, it might help if you let us know what your price range is!
The Rebel line is the entry level line of Canon DSLRs. There are several models/classes that have better performance at significantly higher price points!
If price is no object, follow the suggestion above for the 1D MkIII with at least the 70-200 f/2.8L lense (I would use that lens no matter what body you have for sports). It is the fastest camera out there, which makes it great for sports.
The new 40D is a much more affordable "prosumer" body that features 6.5 frames-per-second, which many in these forums are using for sports, because it's the fastest prosumer camera available. So, if you have a spending limit of less than $5000 USD, the 40D and the 70-200 f/2.8L lens would be a great combination. Your f/4 lens will tend to be too slow to get sharp action shots.
Hope this helps,
Tony
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Several Canon cameras, too many lenses and stuff to list 
If you want to see pics from a recent day trip to Mount St. Helens, an active volcano in Washington State, with a 5D, click here
Tony Long Photos on PBase