There are a number of Orb owners around here with 1070's, I believe, and the combination seems to work well for folks.

Not having heard the Onkyo 502, I don't know what sonic differences might exist between it and the Model 1070. The 1070 is certainly a pretty significant performer, and I suspect that you'd enjoy having it, but if it would be painful from a budget standpoint and the 502 is still taking care of you then you could always sit tight and wait a while - even after the 1070 is discontinued, there will be opportunities to buy used units (the warranty is transferrable, so Outlaw support will still cover you the same as if you bought from them) and by this time next year there may even be a new Outlaw receiver that is at least as good as the 1070.