5 Reasons to Buy a Hybrid or Diesel Vehicle

"If gas prices climb, just 7% of Americans will consider buying a more fuel-efficient vehicle," says a recent MSN/Zogby Poll.

With the average price of gas here in the US being $3.21/gallon, as of yesterday, what will motivate us to start considering other vehicle and fuel options?

If you are, however, in that 7%, how do you know what vehicle is best for you? Do you go hybrid, electric, diesel, bio-diesel, or hydrogen? How does a person choose from all the options?