I have a 60da which I have done some Milky Way shots with. This is a single 30 second sub using an ef18-35mm lens. Betwe processing should have brought out more Ha though. The M20 and M8 image I posted from the last star party was shot with that camera.
http://astrob.in/188992/B/rawthumb/gallery/get.jpg
I dont have much experience of wide field imaging though so can't really comment on other options however I might try a modified 5dmkll this weekend with the same lens if the weather holds out.
Cheers