Blanc only has two seasons under his belt. He would be a risk.
Pellegrini has a contract with Real Madrid and in his first season there, and unless he is fired, the guy is out of contention for a job here. So he doesn't seem likely.
Benitez has the most experience and has won the most trophies out of this list of managers. He's probably the best one on the list and somewhat realistic as well if Liverpool decide to take another path after this season. If they do, then we should go for Benitez.