I've got two pairs I use MSR EVO's with tails- good aggressive bottoms/crampons and very good bindings- the tails give me some flexibility depending on the snow; the other pair is sold as youth shoe- MSR Shifts, but I found it fits up to about 12 size shoe- these are shorter (and lighter), but still have aggressive bottoms/crampons and a good binding- these I use mostly for spring conditions when the snow is more consolidated
if you're heavier or mostly in powder conditions, MSR's Lightning's can be had in 30" length and can also add tails too
