Chris, I see situations similar to what you describe pretty often. And this is just my personal feelings, but I really wouldn't purchase a used Opti (for a fair price) unless it had some warranty time left on it. If it was a straight Merc EFI with no warranty I'd jump on it, but not the Opti-max, and especially not one manufactured just prior to the race to meet emission mandate.
4Fishys, "fantastic" is quite a stretch, but Thank you, and you are more than welcome. I think you made the wiser purchase. What engine did you have on the boat, how bad was it blown, and are they keeping it as part of the deal ?