Some other ships you might want to fit in there are the Nebulon B-2 and the Assault Frigate. The Corellian Gunship and Corvette would make good small classes. The good ol' rebel freighter makes a nice transport class. The T-wing and E-wing would also make more good alternate fighter classes. The E-wing might be better suited to a New Republic set, though.
Here are a couple image pages I found that might help.
Corellian Gunship
Assault Frigate
Rebel Freighter
E-Wing Fighter