The scoutmaster is a very nice upgrade and you'll be able to get the ring later. But if it will be a long time before you upgrade more, I think I'd put the Signature arm at the top of the list.. at least the wiring upgrade.
Also, you'll come out ahead if you sell the Scout rather than trade it in, even minus the tonearm. I sold mine for over $800 on ebay.
Also, you'll come out ahead if you sell the Scout rather than trade it in, even minus the tonearm. I sold mine for over $800 on ebay.