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...... your OT Guide 147 weighs about 76 lbs. .
An OT Penobscott 16 RX weighs about 58 lbs. , and other Rx canoes in the 16' class weigh in around 60-62 lbs. .
Composite canoes in the 16' range can get lighter yet , perhaps anywhere from mid 40's to low 50's .
With added length and a bit narrower than your Guide 147 , other canoes will glide better per stroke which can make it seem you are lighter on the water .
If your paddling use is going to remain similar to what you presently use your Guide 147 for , then you should find a good selection 16' class (plus or minus) recreational or touring canoes in either Rx or a composite ... but both cost more than a Guide 147 , and the composites maybe 3-4 x's more .
I think 1200. bucks for a lighter (50 lb. or so) composite "used" is a reasonable figure to anticipate ... others could chime in on that .
...... surprised I was when I went back abd re-read the OP !! In my mind (I guess) I had already thought the OP answered that question ... I had the Guide 147 in my mind .
In any case , it takes response and participation from an OP or all who try to be of help in some way are just wasting their time . You know as well as I very many OP's who ask a question , never have the curtosy to respond to their responders ... hopefully kevinj will be different than that .
The Swifts seem to be the lightest available. They infuse and have integral, foam and fabric rails and will, if one uses the key words "Matt Finish, will skin coat above a champagne gel waterline patch.
I suppose the prospector series would be closest to the OT Guides, but the 16 foot Kee at 33 lbs is their best seller, and there is a reason for that. Kinda tough to pick w/o paddler weights, gear, length of trip, dog, etc, questions being answered, but limited vacation time have ~ put paid to 18 footers.
WeNoNah has an array of 16 footers too, skin coat with aluminum rails but wet bagged, so heavier and more variable in weight.
Hemlock makes a nice 16 ft Eagle, hand laminated with wood trim.
I haven't seen a new Mad River tandem in years and Bell has been gone about as long, so choices diminish.