so i'm trying to decide what sled i want to buy for next year and i'm a big buy and can't figure out if the Pro RMk 163 is really that much better than the 155. i'm going to be riding deep snow but i would also like to go ride around the lake with my kid some weekends. So will the 163 be that much better than the 155 in deep powder. High marking doesn't really interest me, but i will be mountain riding here in alaska. Help me out...Which one??