I have several Maxxum/Tamron auto lenses that are for a Minolta Maxxum 600si, including a 200-400mm Tamron Zoom... Practicallity is esential, especially cost.
What about the Minolta 7D? :idea:
This camera has the 'Anti-Shake' built-in to the body, so all your old lenses will be IS enabled
and the 7D's noise is comparable to the new 20D! :-) :-) :-)
Your 200-400 with comparable 'IS' over Canon will cost you over $1k alone