Also remeber that if you get a metal one it's going to get friggin' hot in the summer and cold in the winter.
that is true. i drop around with my b&m ss knob through a winter and summer and it was miserable through most of those times. when it was cold it actually hurt your hand and when it was hot i'd have to do my shifts quick as possible
but...now i have a sparco globe-r knob which is also metal but it's actually pretty good in the heat. even on hot days i can keep my hand on the knob without being uncomfortable. i still do have a problem with the cold though