I think the most bang for the buck is the UltraPlus pak, but it won't be the least expensive. It won't be free no matter which way you go (short of sticking with 08 version) but the 30 day money back offer will let you try it out before you are totally committed to any particular package.
You will enjoy the real stuff, and having all of the styles and real tracks/drums is a big plus.
Good luck.