The Mac will have the highest resale value, just because of the following the company has.
As the owner of the B&W 803-D, I can tell you their resale value is disappointing. I decided to just stick with mine, but you could look at the Paradigm Founders range, particularly the small floorstanders which I thought were an amazing bargain. If you go that route I would keep the sub initially, but if you decide you can go without the sub sell that later.
I’m not a big Marantz fan. I would look at Parasound or perhaps Prima Luna for amps