Oh right. I was thinking the 's' model. And here I thought you dropped 5 large on a camera. You must have bought yours before the 20D came out cause the prices sound the same. I take it you have fast glass for your indoor sporting shots? I need some too, but damn they're expensive.
According to some reviews I read, the 20D compares favorably to your model with the exception of the smaller - less than full frame - sensor, and might even surpase it at the higher ISO's (ASA) noise wise.
As for photo storage; I've got a DVD burner in addition to a Linux server with oodles of gigs. But I'm thinking this mini Mac might be a good digital photo post processing machine to add to my in-house network. Hell it costs less than the fast glass.
As soon as get a digital portfolio built up, I'll give you a ping. Shouldn't take too long. As you said I know I'll shoot more frames with this than I ever did with film.
The 1DsMII runs about 8K. The 1DMII runs a little less than 4K. I looked at the 20D, and it's an excellent camera, but much of my photography is sports. Image quality for portraits, etc, is almost identical. I was shocked at how well the 20D performed at high iso. The difference between the cameras is in the autofocus, build and frame rate, which doesn't make much difference until you're trying to get players running at you, in the middle of a pile, or going through a play sequence.
The 1DMII uses predictive autofocusing, which tracks the speed of moving objects, and also stops autofocus for approximately 1/4 second if another object (like a player) comes in between the camera and the locked on subject. It will move the autofocus point to one of the other points if the subject moves off-center, and is selectable to use 1, 7, 13 or all 45 points. In this photo, for example, 
it would have been easy for the camera to focus slightly behind the ball carrier as he was moving directly at the camera, or to lock onto the back of the defender, as he was covering the center focus point, and was the closest object. Because I'd already locked on the other player, the camera moved the focus point to one slightly off-center and continued to use predictive autofocus.
Currently I shoot with a 70-200 2.8L and 550EX flash on high speed synch for football, and a 50 1.4 for really dark gyms inside (referees are really touchy about flash in our area for inside stuff like basketball).