I think Tamiya, while no longer the acknowledged "king of kits", is still very appealing.
In the armor department, they've started releasing a bunch of retooled or new kits which are beautiful. While not the most insane level of detail (think Bronco or some Dragon kits), they're still superb. Plus, they've continued their tradition of great fit and clean molding.
The trend I've seen in armor modeling is that modelers will purchase Tamiya kits and supplement them with a bunch of aftermarket. Because Tamiya is still a major player, aftermarket abounds. And because their kits are so well engineered and easy to build vanilla, they're a great choice if you're looking to pimp your build.