OPC question (2nd hand convert, or 2nd hand OPC)

Hi,

Any one with experience with OPC cars, would appreciate your comments.

Am considering an OPC car, but due to the different rebate schemes, not sure which is more value for money.

Let's assume I'm eyeing a 2 yr old car.

1. 2nd hand normal car, convert to OPC and get the rebate.

2. Direct 2nd hand OPC car.

Thanks.