We can go straight to FL430 at every weight/temp combination I've seen so far, and almost all of the time FL450 is doable. Been to FL470 numerous times, but that usually involves either ISA not-too-high and/or burning some fuel (or a light payload to start with).
Edit to add: if I need FL470 to top weather I'm going around it anyway. FL450 to go straight over weather topping in the upper 30's is one thing, FL470 for weather going into the 40's...naw, not playing that game. 470 is when we're looking for smoother rides...