Les Paul (Guitar Hero 3: Legends of Rock, Guitar Hero: Aerosmith)

These are probably the most common guitar you are going to find. They tend to act up a bit, but if you are lucky enough to find a "Kiosk" or USB wired version of them around 100$ USD or less, snag it, as those are extremely rare and work as well if not better than the Xplorers.

There is also the Aerosmith version that came with the Aerosmith game.