Yo, just back from Whistler and seeing the P4s, Gotamas and Prophet 100s in action.
For a small guy, I'd hit up the P4s -- they are thin like the Foil but with more sidecut, the lightest of the bunch, and they cut through pow like a hot knife through butter. Super easy to spin too. I think they will be a favourite for big mountain over here in North America soon. We're talking 106 underfoot though so forget most east coast resort skiing. At least there is some sidecut though so you'll be able to edge.
As for the Gotamas, as to be expected they are a little heavier -- but not much-- ! -- and more of a big mountain ski than the P4s: thicker, will cut through chop & crud & windblown more easily. But not as heavy as a K2. Less sidecut too, thus more stable in the deep but less easy to manouevre on-piste.
The Prophet 100s are, I think, more specialized than either. They are more unidirectional to begin with, they have the torsion plates front and back, and they love to go FAST -- I wouldn't get these unless you lived out West and can haul ass on 50 degrees.