i have a nextwave navigator NCC500
i suspect it was got off ebay with a offer bid ( i got it from the first guy)
its a basic box, moves a motor, has a very basic on screen menu will control a corotor.
i suspect the US Legacy II also fits into this catagory.
it should provide the basic functions of a analog box , move the dish and control the corotor.
but i know after playing with it ( the nextwave) a bit i really liked the upper end model GI 450i & 650i . You can find these used even a upper end toshiba 2220 for a bit more than shipping and they have a proven menu ( which is easier to use than the nextwave).
do not buy a receiver without a remote ( unless you have one that fits it)