This won't be much help but I've never seen a mixer with 2 headphones jacks. Why would there ever be a need for 2?
Surely a splitter would achieve the same results? Unless you wanted seperate controls for each headphone (but again, I've never seen a mixer offer this functionality)http://www.dv247.com/studio-equipment/h ... tter--8610
I have been looking recently too as I need to replace my mixer for something slimmer - Elcer Nuo 3 if I can find one for under £300