Photo distribution website : from a customer point of view?

I'm checking out some websites right now where I would like to sell my photos. Here's what I want/need :

User friendly website for a customer to buy (no sign-in required, I would like a customer to come in, put his credit card info and download, don't know if it's possible).

A place that handles the transaction itself so you don't have to mess around with SSL certificates, etc.

Offers digital downloads (I don't really care for prints at this point).

I want to set my own prices.

Some of my customers may speak french so having the option to change the language would be a plus.

I've been looking at ExposureManager, Printroom and Smugmug. If any of you have any other suggestions, please tell me.

I'm really focusing on the customer part of the deal. I don't really care if it's a pain to set up for me, what I really care about is for it to be simple as hell for the customer to buy a photo.

My customers frequently tell me how easy Smumug is to use, how they love the ability to crop in to the image that they prefer, and how simple the overall purchase experience is.

I have used Exposure Manager since last August. My customers find it very simple to navigate and purchase prints. You can also offer a download option. You set your prices.