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@gbj_tester
38mm to 44mm for road/XC stems, a bit more for some DH stems.
Headset stack varies quite a bit:
Chris King 13.7+17.7=31.4 (not the highest, I have a 33.5mm FSA on my desk and others may be higher still)
Crank Bros Cobalt 10.03+10.53=20.56
Cane Creek Aer 12.05+7.9=19.95
"Crank x Creek" 10.03+7.9=17.93 (lowest I know of)
Ideally, you should have a small spacer above the stem, so that the steerer projects fractionally through the stem clamp. Although fork and stem makers sometimes suggest the steerer can finish up to 3mm short of the top of the stem, having it go all the way through makes it much less likely that the stem will walk up the steerer under the cyclic loading and mess up your headset adjustment.