Opinions on Various Sales Modules...

I imagine there are a number of people who have the same question that I do with regard to implementing a sales mechanism in Gallery 2; that is, what is the best approach to use given the existing modules?

I would like to sell photos that would be mailed to a customer, others would like to sell downloadable photos. I see that there is an approach based upon an interface to Zencart as well as a more tightly integrated approach in the respository. I'm sure there are other approaches as well.

* What is being used successfully currently?

I'd like something that is easy to manage and won't be a hassle to set up. (I can do most things with code but just want as much of a turn-key approach possible.)

Thanks in advance!
Bob