The dolmar can be upgraded to 79cc later with just a piston and cylinder swap. The 2166 can me made into a 2172 with just some grinding. So both saws easily upgraded later if u chose. I personally prefer the 2166 as I have a soft spot for Jonsereds.
I would like to try some of those bars. I just don't know what size I may need as I have sold several saws as I am trying to free.up some cash. Give Justin first dibs on trading for the bars if he is interested.