Dane Brugler, Lance Zerlein, and Daniel Jeremiah are probably my three favorites when it comes to mocks. They have the best combination of eyes for evaluating and ears for knowing what's going on across the league.
Strictly for evaluations, I also like Danny Kelly, Benjamin Solak, Ben Fennel, Steven Ruiz, Justice Mosqueta, Trevor Sikema, Kyle Crabbs, and Joe Marino.