The A-s801 has a lot of promise. I think Yamaha has maintained a decent reputation at that level in their line up and the phono stage could well be a decent performer. You end up with options....like the Yamaha phono stage and sell the Vincent or keep them both if the Vincent outperforms. The Yamaha allows for a versatile 2 (and 2.1)channel digital solution as well, so it gives you a lot in one package while still being solid in the analog stereo department . Accessories4less sells factory refurbs for a decent price.
So it's a tidy maneuver, but there are surely other routes you can take. Don't overlook the value of other gear that you currently own. i.e Selling the Debut pject uts a fair dent in the path to something up the line. You could keep the blue and sell the deck without a cart or just put something low end on it for the sale. Music Hall 5.x and Rega 3 level or Pro-ject 1xpression decks (used) might be within a few hundred dollars combined with what you get for the Debut. If you can tolerate white, hi-fi heaven has a new Music Hall Ikura for $650 (their site, not their ebay store..different pricing).
If you are open to equipment that is not "new", there are some very good marketplaces including our own Bartertown in the subscriber's section, a-gon, and usaudiomart. Even the auction site. While not a hard and fast rule, you often find nicer gear has been treated better by the owner so a fair amount of used gear is in great condition.
In the end you will likely do very well if you do a little shopping. You see something that gets your attention and google it for comparative value and some opinions regarding what sound characteristics it might possess and eventually you buy something. If you did your homework but you end up not liking it, you should be able to recover much of any money you invested in it.
Now, as to the suggestion asked for.....I offer you should first replace the receiver.