Daytonaflyer,
You are correct, it IS 50 degrees for commercial (with one steep turn going right into a steep turn in the opposite direction, completed as one single maneuver).
FlyerJosh,
If you look in the commercial PTS, it tells you that the checkride must be done in a complex aircraft unless it's a single-engine add-on.
The entire checkride does NOT need to be done in a complex. You CAN do the bulk of the checkride in a plain vanilla 152 or 172, and do the pattern work in a complex. However, it's dependent on finding an examiner who will split the test up between two airplanes. Some examiners may not be willing to do it. As rickair7777 pointed out though, why not just do the whole ride in the complex? Besides, if you split it up between two airplanes, you need to know all the systems and V-speeds on both airplanes. Not a big deal, just more studying to do.