Why get rid of your Karmas if you like them? I have been riding mine for three seasons and they are great. I have some other pairs but i still love them. It's hard to find a ski comparable to the Karma. Although sometimes I would like a little more width underfoot.
i have a pair of karmas and if you can still keep your karmas but want a ski that is wider underfoot and a little burlier at everything big mountain get a pair of scott p4's in addition to your karmas. thats what i did and i have skiied them almost every day this year and absolutely love them
for an all mountain ski i'd go for line blends, but wait for next years cos they look so rad or some moment tahoes. your skis already sound pretty well suited to the all mountain thang though, so if you wanted to go fatter i'd have to agree with the livelife fans cos surface rules.