for me there's pretty much 2 or 3 cameras to go for given that you want something that handles like your 5D. The
EOS-3 is the one I went for, and is a fantastic bit of kit, and with a AF/Exposure system thats only really surpassed by the 1D series in todays cameras. A similar, but if anything even better option is the
EOS-1V - pretty much a EOS-3 but with marginally faster drive speed 10fps with the PB-E2 grip as opposed to 7fps on the EOS-3. The 1V has a further trick up its sleeve - if you get the optional EOS-link software and cable, it can store and download to your computer all the details you normally get in a digital files EXIF data. It holds up to 100 rolls worth of detail in it's internal memory ready for downloading, so you can shoot a few rolls without having to download the data every roll. The 1V is pretty much the only film body i'd consider trading my EOS3 for.
A further option, and a little further down the price range is the
EOS-30 - it's more the size and weight of a modern 450D, but still handles pretty well. It's also one of the last decent film camera designs that canon came out with, so may be a little less well-worn than the EOS-5's for example (I had one that worked for 2 weeks, 5 rolls of film, before getting a spontaneous case of the electrical never-get-overs
turned out to be a melted flexible pcb - beyond any feasible economic repair unless I can find a donor camera with something else faulty like a busted shutter mech.) The EOS-30 also has a built-in flash, which can be handy.