Dave, sadly that's the 70-200 2.8L IS, not the 100-400.
The 100-400's got extra reach, but some users have said that the
autofocus system isn't quite 100% - apparently in random conditions
it tends to hunt around for focus. At the moment I'm trying
to get my hands on one of those bad boys to see for myself how true
the complaints are.
In any case, the 70-200 is a brilliant lens - when I switched over
from the Sigma 18-200 OS it was like going from VHS to DVD.
Yeah, the Canon's four times the price, but damn, it's worth
it. Here's a shot I took with the 70-200 on my 400D
body:
Meia, as Dave would agree, the prices of the camera bodies
aren't the main problem (although Canon's flagship 1Ds Mark III is
about AUD10,000) - it's the prices of the lenses that'll really
hurt you. 
I just moved up from a 400D to a 50D because
my shooting's finally started to outgrow the 400D's capabilities,
but before that I spent a few months upgrading my lens collection
(and ended up spending about five grand in four weeks ).
I've only had the 50D since Sunday, but this coming Sunday I'm
off to the Australian open, so I expect that I'll have a chance to
get a few decent shots there. Anyway, we're going off-topic
here. I've got some photos in another part of the forum
(here) if you guys want to check out some
photos.
Getting back on track, it sucks that Tangfolio would be hobbled
by EAA's poor service. Are there parallel distributors, or is
that what you're stuck with? Speaking of Tangfolio's, here's
one of the first few photos I took with my old 400D:
