The Oppo code is 256, but it may not be in your 650 as it was only recently added to the PC-programmable remote's software. Your 10-250 uses PVR code 117. The CX450 uses code 259. Try code 126 for the VW100 and code 354 for the Integra.
For the Proscan, try the RCA codes. For whatever doesn't work, you'll just have to learn the commands.
Mike
www.SurfRemoteControl.com