Coax to Optical Converters Anygood?

I bought a cheap optical to coaxial from monoprice and it does convert, but definitely not hi-fi grade.

Trucker, Thanks for the response. My transport is a 47 Labs Flatfish that has been upgraded with a super clock and BG caps. My hope is to find a converter that will compliment it and not loose the magic that it produces.
Thanks again.

With so many DACs available across all price ranges, why are you looking to purchase one that lacks the functionality you require? No matter how well implemented, adding another conversion to your signal does not seem like a good idea.