I have really enjoyed this thread about reloading. The taper crimp is the way to go for semi-auto's as I have seen a roll crimp cause havoc because of the headspace issue as Thor pointed out.
Additionally, I might mention the added advantage of crimping in a seperate die from seating. This will make your ammo much more consistant/accurate.
Lee sells a die called the "factory crimp die" that has the additional benefit of a carbide sizing ring which will eliminate any "bulge" caused by the reloading process. I have found this useful in a few of my guns with custom 9mm barrels which chambers have tighter tolerances than mil spec barrels, where any slight bulge will cause feeding problems.
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