Lib Tech Attack Banana EC2 Snowboard 2011
Attack Banana is more forgiving than that Rossi. The One Magtek is real stiff and fast so I don't think it is an ideal first board for you.
The Attack Banana is a mid-stiff with a rocker between the feet and camber underfoot. More playful and forgiving than the One Magtek with more pop as well. Has the Magnetraction you want too.
The only downside would be the Extruded base, but Lib Tech makes good bases and their extruded isn't as slow as other brands' extruded bases.
Oh, the 159 is good size. It has a contact length closer to a 157/158.
By the way, I see you are in SE MI. Snowboards.net is a part of the Summit Sports family. Michigan based with shops only in Michigan.