Seriously, Peter. Nobody is going to know your system's pros and cons like you do.
I believe any consumer should rightfully be suspect about any dealer's recommendation for a product they carry always has the potential to be subjective since they are in business to sell. Yes, I know there are some good dealers and bad dealers out there.
As a friend had said in a recent post, the best thing one can spend on their system is time. I'm convinced now that there is no substitute for time.
And I think the way you've been buying and/or borrowing power cables and in-line conditioners to demo in your own home is an excellent example to determine for your system, which works best for your system and your own preferences.
-IMO