I'm looking for a Canon mount tele. I've got an Elan body and I'm looking for a 100 to 300 or so.

A Canon USM or a Tamron or a Sigma. I like the AF feature.

These go for $200 to $400 so any deals would be appreciated.

...Seems like one has to be careful since Canon makes both quality and junk in this category.

Any tips on using this type of lens especially in sports photography appreciated.