I just bought a 10D and want to buy the very best glass for it but
I can only afford one or two lenses right now. I really want tack
sharp results.
If you "really want tack sharp results," then buy and use a tripod.
Seriously. In all likelihood, you will find it is the one piece of
photo equipment that most visibly improves your pictures -- in
fact, they'll not only be sharper but also better composed and
better thought out. Just a suggestion!
As for specific lenses, choose based on focal length, not based on
MTF curves. Pick lenses that will get you the pictures you want,
and buy something of at least decent quality. Lenses are like
furniture -- surprisingly expensive, but you only feel the pain
once. Then you have to live with your purchase for a long time, so
don't skimp much. You don't have to buy "L" series lenses. If you
buy regular old Canon lenses, you really can't go too wrong.
I strongly suggest you take a look at a book like National
Geographic's "Photography Field Guide" to get a feel for what
different lenses will do what, and also to give you inspiration to
go out and shoot. It's one thing to have nice camera equipment,
it's quite another (and MUCH more fun) to actually use it! ;-)
--
Brian Kennedy
http://www.briankennedy.net/