I have gone the rounds on airpots over the last 5 years... I have finally settled on 2.5L Bunn Model 32125, which is a stainless steel lined airpot with a handle pump. This decision was not arrived at lightly...
I went through multitudes of glass-lined airpots. They break too often when you do a lot of transporting, and the newer stainless models have just as good insulation. About 2-3 years ago I started using some imported 2.2L airpots from espressoparts.com that would frequently go on sale for about $15 each when purchased in lots of 6. There were 2 small problems with these:
1) These would vapor-lock when steam would condense in the pump, which would then cause the pressure from the heat to force the coffee out as a dribble, even when the device was in the 'closed' setting.
2) They were just a little bit small for my tastes. I wanted something bigger.
Then I switched to Oggi 3.0L stainless airpots, which I was getting at Bed, Bath, and Beyond - everytime they would send me a decent coupon (e.g. $10 off a $30 purchase, 25% off, etc.) These were great! The retail price just went from $40 to $45, though. The problem I had with them is that my Bunn Airpot brewer seems to have a sweet spot for 2.5L batches, and the recovery for 3L is long enough to where I can get 15L quicker with six 2.5L airpots than with five 3L airpots. The Oggi is slightly less insulated, too.
The local Cash-N-Carry has the Bunn 2.5L airpots for about $35 each, and I found them to have the best insulation properties of any airpot so far. If I brew coffee for an evening theater performance, the coffee is still hot enough the following morning so that most coffee heathens wouldn't know the difference. They do not dribble at all. The hand pump is more durable than the bellows kind of thing that the Oggi and most other airpots have, and seems to deliver faster when I am belting out cups during intermission.
I have tried many other airpots, but I am doubtful that one will beat out the Bunn in the realms of price, durability, and insulation.