The 1/43 are a bit large, but perfectly usable IMHO.
But I recently got some Battle Machines (look at Rich's first post, first pis, right-hand car) and they look darn good next to Hasselfree's not-Lara-Croft miniature. But most of the vehicles in that scale fall smaller when you look at things like Semi & trailer, buses, and other larger vehicles. Plus I have not had a lot of luck finding like scale motorcycles out there.