I think a used Atma-Sphere MP-3 would thrill you to no end. I haven't heard the Supratek or deHavilland to offer any comparison.
Since the Atma-Sphere unit has balanced outputs you would probably want to use balanced to single-ended transformers if your amps don't allow for balanced operation. You can also use the tape loop outputs for single-ended operation.
Since the Atma-Sphere unit has balanced outputs you would probably want to use balanced to single-ended transformers if your amps don't allow for balanced operation. You can also use the tape loop outputs for single-ended operation.