I'm using a 30D, and I think that now...I have even outgrown that. Missed focus, back focus CRAP focus drives me batty. I came close to throwing my damn camera onto the ice from the second deck one night. FRACK!
sec...I'll show you an example (if you don't mind, of course..)
..I hope you don't... 
Anyway..here's this one...alright focus, happy Marc, smiles all around! Huzzah!
This one however...^%(W*Y$$*#()!!!!! Great shot...DAMN THE BLUR BACKFOCUS! What in blazes am I doing wrong here. Same technique as any other shot from that angle in the rink, centre spot focus, AF AI Servo (One Shot is worse). THIS makes me want to jump on the ice, and Pete Townshend my camera on the faceoff dot. Using 30D w/ 70-200mm L f/2.8 non IS
**sigh** **pops prozac**