Im sorta ruling out the 35mm (L, im undecided on the non-L) and the 50's (canon and sigma) since I cant decide which brand is better.
which one out of 85L and 135L on a 7d? So 136mm v.s 216mm. Too tight? I think so.
I have 35L, 85L, and 135L. 135L, as great as it is, for crop body, it is too tight for most things especially indoors; however, you go outside and shoot a portrait against a nice far background, and it's magic. 85mm can be made to sort of work, but you would have to stand back quite a bit if you want whole body shots or group photos. This is why 35L gets the most use on my cropped body, and it's beautiful, but it is no 85L when it comes to f/1.2 bokeh.
Still, picking up a clean 35L on the used market is a fantastic idea.