You advised me to go with Kombat for Chicago BJ conditions. Now i'm looking into it a little and would like to know if there are any significant differences between 2005, 2006 and 2007 models. Some retailers offer pretty good discounts on older kombats so I'm inclined go for it unless you tell me otherwise.
This is what I found:
2005: 105L 245cm, 65, 41.2, 7.3kg
2006: 106L 245cm, 65.5 40.9 7.3kg
2007: 107L 243cm 65.5 40.6 7.2kg
To me the numbers look really close.