I think it would be a total waste of money. Marantz makes fine stuff, so unless there is something really special you need that it can't do, you might as well just flush your money down the toilet as buy something else. And unless you are very careful in what you bought, you could very easily end up with lessor equipment as well as having less money.
It would probably be better to spend the money on therapy in an attempt at ridding yourself of the disease sometimes called "upgradeitis". Probably, it will not cure you, but if you can't stand having money on your hands, this is another way you can get rid of it. Otherwise, spend your money on more CDs, as mtrycrafts suggests.