Subarus have the 5x100 pattern but a bigger center hole. I have not had issues going lugcentric. You'll also have luck with chevy cavaliers and PT cruisers. THere were LOTS of 16" rims on cavaliers back in the early 2000s. Remember these:
The list is huge and toyota has a tiny center bore. You should be all set.
I got subee rims for my wife's prius for $5 each off CL.
I agree with the 15" suggestion as well. If you dont' already have snows you should be able to get some 195/65/15 Champiro Ice pros for $109/4 this black friday from DTD.