Tama and
Yamaha both make quality drums. The Rockstars have mahogany/basswood shells and the Stage Customs have birch shells, so you would be moving to a different sound. Whatever you get, you want to hear it played and play it to be sure you like the sound.
Stage Customs are at the low end of the
Yamaha line (as are Rockstars in the
Tama line), but they review very well. If you want to go to a birch shell drumset that is widely acclaimed as a high quality set, check out the
Yamaha Recording Customs. Can't go wrong there.
Good hunting.