If you start out with a huge compromise, you will need to start upgrading right away (or at least feel that way). If the budget is $500, use that as an upper constraint. I'd throw Music Hall into the mix. Even older B&K pre and power combo.
Finally, the 80's had some very low points, be careful! 80's NAD vs new NAD is a huge difference. They have come a long way. Same with Adcom.
Finally, the 80's had some very low points, be careful! 80's NAD vs new NAD is a huge difference. They have come a long way. Same with Adcom.