The GS9's are some of the best Eastern-skier all-mountain boards I have ever ridden. I would not even compare them to the skicross 7's. I demoed the skicross 10's the same day as the GS9's, and the 10's don't even compare.
The GS9's will be much more lively, stable, and have superior edgehold to your skicross 7's. You will likely be surprised at how versatile they are - you could ski an SL or GS course with this ski.
If I had to have only 1 ski, I would choose the GS9 (for the East, as they are wonderfully narrow).
My skier profile: 5'7", 155lbs, former collegiate racer.
I ski the GS9's in 180.