Buying a good driver- will it make that much difference?

So the question is: Buying a good driver- will it make that much difference?

Firstly let me answer the question with a question: What do you class as a good driver?

Is it:

A) Something of a well known brand with high price tag, e.g Callaway, Nike, TM, Cobra, Titleist et al

Or is it:

B) Something that regardless of its branding and marketing hype, really suits you and your swing whether it costs £10 or £310.

I'd say go with option B and find something that suits you regardless of cost or what others think of you, as often in this game the need to have the top rated branding to fit the sterotypical golfer we see throughout clubs overrides the actual ability to use or be suited to what is bought (if that makes sense)