A front side carver is a ski that can carve pure arc-2-arc pencil thin lines in the snow while pulling serious g-forces. A slalom ski can do that up to about 30 ish mph. A GS ski can do that at the larger radii that will come with higher speeds, but will have difficulty doing so at small radii. A cheater GS ski at say 16 to 20 m radius is a half decent compromise. It all depends on how fast you want to ski. Just as a point of reference, pulling a 2g turn at 25 mph would equate to a turn radius of about 6.5 m, but at 50 mph it equates to a turn radius of about 25.5 m. (note that is the radius of the turn, close to that dialed up by tipping the ski, not the sidecut radius).
Ghost, I was surprised recently to read that average FIS slalom speeds are higher than this, up in the low 40's. OTOH, mine aren't, ah, quite that fast, so I can only surmise about G's.
bttocs, go check out Ligety here, notice what a deep flex he's getting, not riding anything, but the G's are evident from the angles he needs to stay stacked: http://www.nytimes.com/newsgraphics/2014/sochi-olympics/giant-slalom.html Nope, we can't ski like Ted, but he's a perfect demo of the physics of a wonderful GS turn. By contrast, check out MS, who shows how good modern SL involves a decent portion of each turn devoted to non-carving, with a little pivot, some steps etc: http://www.nytimes.com/interactive/2014/02/21/sports/olympics/womens-slalom-results.html It's too fast to carve a complete round turn.
levy1, IMO the Rossi in that list is the most forgiving by far, then the RX12, then the Volkl and Blizzard R-Power, close and getting into the less versatile but better at real speed category. Cannot comment on the rest, except that one of them (Blizzard Mag GS) appears to be the WC version, which will be seriously more demanding, and probably a handful off course. Ghost may enjoy skiing GS on civilian slopes, but for those of us who believe in human neurological data and physics, either you safely ski a real GS at 1/2 its potential - which is like only driving a Ferrari around a big city on surface streets - or you ski it in its pleasure range, which makes you a menace to other people on the slope. But lots of people drive exotic cars exclusively around places with traffic lights and cops, so who am I to say?