It depends on what you want to do. If you need to use midi then I would look at sonar or cubase, ones in that class. If all you want to do is record audio then the Cake walk guitar tracks pro would be my choice.
It costs a little more than the guitar tracks 2 but has more plugins and a better drum program.
If money is tight though go with the guitar tracks 2 and upgrade later, Cakewalk has one of the best upgrade programs around.