First off, have a great time on your level 2 course! It's sure to be a great experience.
In my level 2, people were on anything from 68mm up to around 88mm (on a twintip). Consider the expectations for the level 2 and choose a ski that balances your ability to ski the following:
- Terrain: green/blue/black groomers and some bumps
- all turn shapes (small, medium, long)
- low to moderate speeds (may be encouraged to "ski fast" at times)
- skill demonstrations (wedge, garlands, sideslips, one foot, javelin turns, etc as decided by conductor)
so factor that into your ski choice. "all mountain" is such a broad banner--my all mountain ski for the course was a 70% groomer ski with a 72mm waist and 14.9m turn radius. A friend of mine used a Peak 82 to pass last season - he was a strong skier though relative to the standard. Like skidude said, it depends on your strengths and development opportunities. I'd avoid skis primarily intended for off-piste. But hey, if you can ski it to the standards required, it'll work.
If you can ski to this standard on your gear, you'll pass the ski portion:
Keep in mind these are level 4s skiing at the speed and "performance" of a level 2. If you go to a clinic/PDP session, it'd be worth asking your clinician based on your individual situation. (you probably already know this, but PDPs are free for members!)