well i guess the G2 and E series are candidates too....again it'd be best if you could handle them and decide for yourself. the streamlight scorpion is both hated and loved. some like it for its cheap price and good value, others hate it for a plethora of individual reasons e.g. the rubber sleeve, lack of water resistance, etc.
as for the switch (clickie vs momentary on) you have to make a compromise between convenience and durability. the surefire or pelican M6 style switches aren't going to wear out easily, but you might find the scorpion switch more practical.
too bad the pelican M6 hasn't been released long, so we don't know the actual lamp life though the manufacturer states it to be much longer than either the surefire or scorpion lamps. if the lamps live up to the manufactur's claims, then i think we have a clear winner (PM6). according to posts here by other members, the scorpion lamp does die very fast similar to the mini maglite lamps.
personally i would go with the PM6; the value is pretty much unmatched by any other light on the market since it comes with a holster, is very water resistant, and (supposedly) has a long lamp life /ubbthreads/images/graemlins/smile.gif