Maybe check over on solotripping.com - you'll get more info than you want!

My best advise is to not rush it.  Instead plan a year or two away.  Rent rent rent!  Try as many different boats as possible.  Also attend a symposium or meet-up if you can.  People at these events are happy to show off their canoes. 

Everyone has their favourite.  They're like ice cream.  My favourite is the Argosy.

I do know the Prism is a very popular boat.

Strongly recommend to look for one used.  Unless it's really beat up you'll save cash.