I have my new Acme prop picked out (13R x 12 3 blade) for my 99 E22. The prop is almost $100 less at propellersonline.com than ACME is asking for it. Is there a reason I should pony up more money to buy straight from ACME? (Better warranty, exchange/return policy, etc.)? I sent an email to Bill Weeks at ACME, but he has not replied yet.