I WOULD NOT waste my money on any "thermo-electric" cooler - they'll never keep the goods cool enough on even the warmest days - and they run constantly / NON STOP !
look at the units that have compressors in them - they'll run less and they'll have no problem keeping up in the hottest (texas) weather !
Its amazing how much more room you have in a cooler when ice isn't consuming space ! The freedom of not having to buy ice or worry about where you're gonna get it is huge - no more over priced ice at the track etc.