The new Nikon that's coming out (the 2DH), I think is going to be a disappointment for sports people, especially people like me who cover high school, which means dimly lit gyms and night football. It only goes to 800 asa with expansion and internal noise reduction software to 1600, but that means they're having some significant noise issues.
I shot film for around 20 years, and went seriously digital about 3 years ago. I do NOT miss the wet labs, film processing or chemicals. You're going to be thrilled with the 20D, and the first thing you're going to want to do is probably get a good DVD burner. With those 8 megapixel files, you'll have a 1 or 2 gig compact flash card, and about the third time you end up storing a photo session over four cds, you'll want the DVD. My primary sports site is http://www.crawfordamerica.com. Oh, you'll also end up shooting more photos in six months with digital than you did in five years with film. If you get some stuff up on the web send me a ping. I'd like to see it.
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.