Not that do that style of photography but when I took my course (film days) the 85 mm & 135 mm's were recommended, so with a 1.6 crop I'd be thinking 50 & 85 mm lenses & fast to blur the background. There's a similar question here.
Concur, 50 or 85 for a crop. More specifically I'd go with the EF 50 f/1.4 or EF 85 f/1.8.
If you have plenty of space and plan to do more tight portraits then the 85 would probably be best. If space is not so plentiful and you also plan to shoot group shots, then the 50 would probably be the better choice.
Portrait lens and zoom lens (2 lenses) or a zoom lens that is good for portraits?
If you mean 1 lens, are you saying you want a zoom and you don't want a prime?
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