both the tweak and stomp are stiff skis in the realm of twin tips... they ride and carve real well and perform well on the whole mountain. If you hit mostly powder then go stomp, if you only get into it occasionally the tweak is fine in the powder. In the park, they can be a little hard on landings but have plenty of pop. they also have big solid edges for rails. the 172 would be fine for you, but the 181 wouldn't be out of your range (just that much more ski). the pe or the tm are probably the closest to these. i don't have any experience with line, but from what i hear the 1260 sounds comparable.
'Because it is there...'
-George Leigh Mallory