Personally, I would go with black. I am not big on chrome wheels for our cars.
When you say you don't have a budget does that mean you have no money to spend or money is no object?
What are your goals for the car? Will you be doing suspension work, i.e. coilovers or springs? What do you intend to do with the car, track, street, both?
Width is just one element in fitment. Offset and backspacing will also determine flushness. An 8.5" wheel can be flush given the right negative offset, etc. A 9.5" width wheel can be sunk in given a more positive offset. Generally for the GR, somewhere in the +38mm to 42mm offset typically gives a pretty flush look without any or just a little work.