Used doubles and wing cost estimate?

Not sure if I'm going to sell off some gear yet but wanted to get an idea about what is a fair price for the following:

OMS double 98's with OMS manifold and bands. Origonal hydro 9/97, next due 9/07, good shape with normal scratches on the bottoms.

Dive Rite Super Wings that were only used a few times.

Dive Rite aluminum backplate.

Thanks for the help.

Look back through the ads here, and you will get an idea of what stuff has been selling for.