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ASU2003,
Well it seems for you application the zoom would be the answer. I shoot a lot of sports and use all primes for the super telephoto lengths, however, I also use two bodies (sometimes three) because I need the flexibility.
You are right in that using the 300/4 you might loose the wider focal lengths of the zoom. Personally if flexibility trumps image quality, I'd go with the zoom.
Canon does make a 400/5.6 that goes for around $1000. I've never used it, but it's fairly light and has excellent image quality. I wouldn't count on Canon ever making a 400/4 for less than $4000 - they'd lose too much money on their current 400/4. Also when you're talking about a lens like that, it's going to be massive and very heavy. I have a 400/2.8 and that thing isn't even hand holdable for more than a few seconds - you're shooting it with a monopod ALL THE TIME.
In terms of tele-extenders - try not to use them. I shoot for a paper here in NYC and even though I have a 2x extender in my bag all the time, I almost never want to use it unless I have no other choice. I use a 70-200 a lot and it's fairly sharp. You put that tele-extender on it, and it looks like you're using a $40 kit lens. The image quality drops THAT much.
Hope that helps out a little.
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