You kind of want to be careful here in terms of "we should be looking for another Berrigan"...
Berrigan was a half/utility that played a lot of 9 out of versatility, based his game on effort, guts and tenacity, and only really played as the starting 9 in a couple of seasons because there were not many other options due to deficiencies in the roster or injury (eg, Ennis). In fact, Berrigan's hooking partner, Casey Maguire, could have comparisons drawn with Paix in that he was also a half that was versatile enough to play as a 14, had a big more skill than the starting 9, but not the same of tenacity. Maguire & Paix had a very different skill set of course, Paix being more of a livewire (like a Nikorima) and Maguire being more a all-rounder depth half, but still.
Just saying that a Walters/Paix combo actually has a lot of comparisons to our mid-00's lineup, the difference is in the balance of the rest of the squad... and... other NRL related limitations...