Well seeing as the 1st gen CL is based off the 5th gen Accord, you can do quite a bit. You face the same dilema as most Accord owners.

My best advice would be to swap in an H22 and then do a turbo. You could also turbo the F22, but an H22 turbo would be more adventageous.

EDIT: www.hmotorsonline.com is a great soruce for motors.