In an open back cab would this speaker

Eminence Patriot Texas Heat 12"


Sound decent in a 2x12 through a mesa lonestar head?

I'm playing this -> http://www.soundclick.com/bands/page_songInfo.cfm?bandID=671284&songID=7191551

If not would anyone recommend a decent speaker that wont break the bank?
Also, anyone know where to find the standard 1/4" jack that most amps have on their back?