<i> If it dont fit like a glove then it never will fit like a glove. There will always be something sloppy about it.</i>

I would say its far more important to get a bike that fits better you can more easily upgrade components in the future if need be
I had a similiar experience with an 18" instead of a 17" I grew to hate that bike over the years I rode it.
I would also suggest you round down instead of up.