Replying to 2009 ar6 or wall 2010?

I can get them for a good price but I'm not sure wich one should I choose...

Im 6'0, 163lbs. Been skiing for 20 years, and I'll be doing 20% park 60% all mountain 20% BC.

So I need and allmountain ski wich will be fine for Park and BC..

I'm a bit scared about the wall since they're symetrical skis, should I mount them true center ? How will they feel carving and in the BC ?

How about If I mount them back ? Will they feel weird ?