John,
Some good advice here. While I don't generally canoe hunt (only because of opportunity) I pretty much do everything else in one. That said, my current one is a used, plastic, canoe-rental cast-off beast and I feel your pain. I used to have an Oldtown Tripper that was Royalex/ABS (I forget which or even if they're different mat'l)that I will forever regret getting rid of. It was longer, lighter, and way more manueverable than my current one. The point is that light-weight space-age material canoes have been around for a long time. You will "slap-leather" for them, but deals can be had and now's the time to be watching Craigslist. Peolpe buy top-of-the-line, use one season, and sell at steep discount when they need a little winter cash. Don't overlook older ones if the price is right. The aforementioned Tripper had been owned by a whitewater junkie and the hull was severely abraided at both ends. The upside is that the alot of the "technoweenie" stuff could be patched quite easily with fiberglass cloth and marine epoxy compared to today's bombproof "plastic", which nothing wants to adhere to. She looked like Fido's a**, but God I still miss her!