Sorry I'm a bit late to this discussion and I know its a bit more than you might want to spend ($1400 gst paid) but please have a look at the 70-300 f4-5.6 L. Its a superb lens and has the extra reach over the suggested 70-200 lenses. Excellent IS too. Not too heavy, hand hold easily.
Samples here.http://photography-on-the.net/forum/...d.php?t=955129 and
here http://www.flickr.com/groups/canon70300is/
No need for the monopod.