Replying to Down to 4 different Charging/Pow skis, unsure which one to get

I've been looking into getting some thicker skis so that I can ski a little bit better off piste than my Fischer Gurus. Right now I have the list finalized to 4 or 5 skis:

Line Supernatural 115
Line Supernatural 108 (Is there a big difference here)
Fischer Ranger 108 TI (Largest size is 182, is that going to be too small?)
Elan Spectrum 115 ALU (Can get cheaper through work)
Rossi Squad 7s (Thicker than I probably need, but I heard the thinner versions are more playful and I'm not really looking for a playful ski)

For reference: I am 6'5, 190lbs, and will be mostly skiing at Marmot Basin.