Thanks for the replys. Don't have to worry about warranty so that is out. Live in Houston so cold weather is not a big problem. The way I see it is that it basically breaks down to this:
1. Boi - has longer preparation time, don't have to heat to use, can mix w/ diesel
2. WVO - have to heat to use (for viscosity reasons), need dedicated tank so you can switch back and forth between diesel and wvo, can't mix w diesel.

Am I in the ballpark now?