The iron breakers/irondrakes and longboard kits are really nice detailed kits.
I like a lot of the free people's kits too. The demigryph knights, and general on Griffin are sweet, and it's all the better that they buffed the demigryph in this book.
I find the bleaksword/dreadspears kit is just really dated, with the giant hands, but the cold one knight and chariot kits, plus the privateers and executioner kits are fantastic.
I love the war hydra and karybdiss, but the rules for them are awful, even worse than they were before the battletome.
I think if I focused on any, it'd be the Phoenix Temple, with shadow rangers for disruption (their rules are so good, as well as their models)