thnx a lot... i would do this !!Best thing to do is make a Nandroid backup in CWM or TWRP and then test CM10 out. Once you've had your fun, just restore that backup and presto change-o your back to your current Rom and setup. If you like CM10 you can make a backup of that too, have fun
How to make a Nandroid backup with CWM and TWRP2: