(You need to Login or Register to view media files and links)"(MN) Wenonah MN III Kevlar 3 seat canoe that works great for families or large loads. Very fast canoe that works great for Boundary Waters tripping. Canoe is in very nice condition with normal superficial scratches. Web seats, aluminum trim. Located near Ely, MN $1500. Call 1-800-365-4531 and ask for Bob. -- Submitted by: LaTourells"
Example above of what you could find used at a reasonable price - the MNIII would be more ideal for your use than a disco 174 - which Old Town no longer makes - kind of blended that into the Penobscot line
search on "craigslist - your city" for canoes as well.
I'm reading your post to be that you would not be carrying any camping gear in the canoe, but would be camped on shore at a state park or something ? in that case, you could probably get away with a 17' canoe - you'd have to have two of the kids in one "slot, sitting side by side, but it would be OK.
The advantage of something like a MNIII is that it will stay big enough for your use as your kids get bigger - so you could get a lot more use out of it than you could with a shorter boat, that will eventually get to be too small for your use. While a used MNIII will be more expensive in the beginning, it will also retain a better resale value for you later on.
And a bonus - it will be a whole lot lighter than a disco - they weigh 80 to 90 pounds!
You can carry any canoe (or more than one canoe) on almost any vehicle. I know a guy that cartops his 17' Old town tripper on an old Geo Metro. If you have factroy installed racks, you can use them as a "base" - pad wiht foam pipe insulation or something - just be sure to have bow and stern tie downs as well as two side to side straps - the straps across the canoe hold it to the rack - the bow and stern lines hold the canoe and the rack to the car - lots of factory racks aren't all that strong.
cheapest way to cartop is buying the foam block carriers - 4 blocks of foam that fit on the gunnels, that rest on the cartop - use sticky shelf liner beneath the foam blocks to help keep them from moving - but same set up with two straps side to side, and a bow and stern tie down.