Harbor freight gets my vote, over 5 hurricanes and still going strong. Spent many days refilling the Generac 12.5KW from the food grade $25 plastic 55 gallon barrel. Killed me on the gas bill but was nice powering the entire house 100% for days when every body was without power. I guess you got to pay to play.

http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=34679