Don't be scared of a 500C if you can find a good deal on one. I got a jammed up 500C that was in nearly immaculate condition, along with a 500EL, and a chrome 80/2.8 for 250 even. The 500C had an upgraded split image focusing screen, and after $300 worth of repairs, I had a perfectly working 500C, 500EL, and 80, to go with my 500EL/M, 150, and 250. I don't consider 550 all told, bad at all for 2 bodies and a lens.