I paddle a Bell Norhtstar mostly for tandem but I have been very pleased with it when I have used it solo.  However, being that it sports an assymetical hull means, as DD noted, that you have to add a permanent paddle station for solo use.  I simply replaced the thwart nearest and behind the yoke with a kneeling thwart but if you're not comfortable kneeling or you want something for fishing then you'd have to install a seat and that would be a bit trickier because the new seat would probably make a pretty tight squeeze between it and the existing yoke while reducing space for gear when tandem tripping.
The Keewaydin 17, which, by the way, is also an assymetrical hull design, is, according to Charlie Wilson (a colleague of David Yost) about as close to the Northstar as you're going to get without actually buying a Northstar (which is lucky since Bell is currently out of business and no one as yet has purchased the moulds.)  They are both designed by DY and have his signature tumblehome which makes both these boats quite adaptable for solo use.