I would for sure keep the A500 with the A530 and sell of the A600 even though you have a 030 in it.
I'm searching for a A530 or a VXL-30 accelerator for my own A500 at this point; if I were you I wouldn't give up the A530.
Furthermore it should be easier to get spareparts to the A500 setup...The 030 is socketed on the A530 right? IIRC it isn't on any of the A600 accelerators.