I loved the Whatever. You don't need the 156, get the 153. It will float fine at 125lbs and then be more playful around the rest of the mountain. I actually think that 22.63 would be the reference stance. I rode it at 22 and was basically centered on the inserts.
For jib the Disaster is a great choice. I even think It's a midwide so 10's are perfect.
Are you gonna be gaining a butt ton of weight soon? Are you like 15, 16? Or just lanky?
If you expect to gain 20-30lbs before Feb then get the 151 and 156...
The Angry Snowboarder Blog Archive 2012 Bataleon Whatever Used and Reviewed
The Angry Snowboarder Blog Archive 2012 Bataleon Disaster Used and Reviewed