You didn't note whether the fiber was for 100, gig or 10 gig.
Both chassis switches, 4500 and 6500, have line cards that support fiber connections.
For standalone switches that support 12 fiber ports (or more), choices are more limited.
There's the 3560E-12D, 3560E-12SD and the new 4900M.
All the foregoing differ in their performance capabilities. The 3560E-12D isn't true wire rate, the 3560E-12SD is. The 4900M and the two chassis series vary based on what's loaded into the switch.
