Walker - 5
At least he seems to based on his midseason top 120 prospect list. The M's got 6 players on the list (which does not include 2012 draftees or recent international signees ala Soler), and 3 of the top 16. Other than Walker and maybe Paxton, he's at the extreme high end of rankings I'd expect to see for any of our guys (and he's probably higher than the consensus on Walker and Paxton).
Hultzen - 7
Franklin - 16 (I love Franklin but this seems way too high for a guy who can't hit left handers at all)
Paxton - 57
Brad Miller - 91
Victor Sanchez - 111
Four teams had 7 players make the list, and three others had 6. I think it's safe to say that if the 2012 draftees were included, Sanchez would slip out the backend, but Zunino would rate somewhere in the 30-50 range.
I can't ever remember the system looking this good. Last offseason it ranked really well, but that always felt artificial thanks to the Pineda for Montero trade. These are all guys the M's have added themselves (all since the 2010 draft except Franklin, who was 2009).