Which iRiver is which?

[triadruid]

I apologize if this is thread is gauche, but iRiver's website(s) have me COMPLETELY confused. I've rarely seem a less useful set of product pages...

In any case, I've posted elsewhere on the site my specs and feature wishlist, and iRiver has come up informally in searches as having good MSC support and being Linux-friendly. But I have no idea which ones are currently for sale and would match my needs! I'm in the USA if that helps/matters.