It's a similar question to who from our side would a top 4 club want?
Ash certainly. I can't see them chasing Carlos, but his displays for Rangers would suggest he can hold his own at that level at CB. Our younsters may or may not prgress to that level, but it's far to early to say. The fullbacks are decent club players and that's about it, although with Young in particular I think they'd do OK. Carew on his day and Heskey when he was younger, so neither really, and Gabby might be a decent squad player for a side at that level.
The one that might surprise people is Collins. Better than we thought and still young enough to improve further. Big and strong and likes to play the ball when he gets it. I think he'll prove to be a top star!