If it was me, I would purchase that Marantz 4001 receiver. Then after a month I would purchase 2 bookshelf speakers. Then after that 2 more. Then a center channel. And finally a sub. This might take a year or so. But for under $800 you could have a really nice system. Just go without a subwoofer with the new receiver? Also, I have ceiling mounts for my speakers because the room is a very open family room/kitchen/dining room and there are no bookshelves to put the speakers on. I rather like the ones I have, even if the quality is so-so.