Im not sure why anyone would need super fast frame rate in 35mm. If you're shooting sports or weddings, you'd probably want to be shooting d1git@l in small format. But that wasn't the question, was it?
I have an F5 and while it is big, I like a big camera that I can wrap my big paws around. It's pretty well bulletproof and if you dont mind spending the extra buck or so a pack, using lithium batteries really lightens the camera significantly.
I also do a bit of manual focus stuff with my F5 and use the 105/2.5 as a portrait lens and am waiting for a 35/1.4 to come up at KEH. Im not sure about the Canon but the focus "rangefinder" in a Nikon lets me use the manual focus lenses the AF assurance of the AF body -- I just have to turn the lens to focus it.
But really, if you are indeed in HS, stop thinking about this body vs that and start thinking long term -- glass. Get a body that does what you need it to (and not much more) and pump every penny you can into the very best glass you can because just like ex-wives, good lenses end up hanging around a lot longer than you expect.