Hi, shortly after purchasing a 2004 Signature 290 with 5.0 GXi's and XDP drives, I found these forums and realized I probably made a mistake. The boat had no problems at sea trial, but one engine just started whining intermittently. I plan to have this boat for a long time, so my question is: if I decide to invest in replacement drives, what is the best possible drive for the money? I am on the (freshwater) CA delta, but would like to use the boat in (saltwater) SF Bay as well. I am looking for the "bulletproof" option, as I don't want to make the same mistake twice! Thanks in advance fo