What do you guys recommend for a good dovetail saw?

The only thing I currently have is a 6" Crown Gent's saw (17 TPI) that my dad gave me. If that's a decent saw, then perhaps it's just my technique, but I'm not very happy with the ease or cleanness of cut.

Ideally, I'd love to purchase Cosman's dovetail saw, but at this point that is way out of my price range. I'd like to know if there is something else I can be looking for at yard sales and shops around town. What do ya'll use, and what can I expect to pay for it?