The same rules that apply to any other component apply here, as well. Rlwainwright brings up in his post, the thing that is most overlooked with digital products; the analog section. The digital section matters, as well. I just say, consider the whole player and not just parts of it.
You mention the Ayre. My opinion is that its worth the money. Its a big step up from the Oppo. (I'm not suggesting that there is anything wrong with the Oppo. Its a great product for the money.) The one thing I really like about the Ayre is that it sounds great with ALL formats. That's very rare. You don't have to give up having a great Redbook player just to get SACD. (Or buy a 2nd unit).
My only concern would be, do your other components justify the purchase? If your other components are not in the same league as the Ayre, you probably be able to hear everything it can do.
You mention the Ayre. My opinion is that its worth the money. Its a big step up from the Oppo. (I'm not suggesting that there is anything wrong with the Oppo. Its a great product for the money.) The one thing I really like about the Ayre is that it sounds great with ALL formats. That's very rare. You don't have to give up having a great Redbook player just to get SACD. (Or buy a 2nd unit).
My only concern would be, do your other components justify the purchase? If your other components are not in the same league as the Ayre, you probably be able to hear everything it can do.