The Liftmaster 3800 Jackshaft opener is an excellent choice for doors with a torsion tube/spring assy and standard track.
Link http://www.liftmaster.com/cw/product_family/0,1064,uid-i3BoamhnZHFtaw==_387-id-42,00.html
The only problem you might encounter is that they cannot be used on low head...