First, the PC are hub centric.
2nd, this is me. I would go 17" Procomp, because I wheel regularly and am stepping up to 37's and it is difficult to find 37's for 16" wheels. Now in your case, that may not be a deal breaker for you. You can find up to 35's all day long for 16's, I know, I have 16's. If savings is important, then I say 16" ProComp.