Age old debate of 600 vs 800.....knowing where you ride mostly, the 6 should be great in the tighter trails, but the lakes I assume might be the the issue. It seems you ride mostly alone or with your son, family, etc.....and if they are all on the same size motor, 600 is good....running with a group that all have more CC's can be an issue.   Not really a bad thing, knowing you can buy a new sled and just need to decide between the CC's and/or track length  !

Similar to truck shopping.....

3 days is perfect in my opinion. Huntsville to Quality Inn North bay ( just north of 11 & 17 junction) day 1.  North Bay to Petawawa or Pembroke day 2.  Back to Huntsville day 3.  We have done it 3 times starting at Dwight clockwise and counter clockwise. 

Pull the trigger. Life is short.

I included an air bnb in my estimate. We are very limited on our rides from home these days. So worth it though.