Miata na vs nb

Hi ct, it’s me again with another Miata question. I am looking at buying a mint condition ‘05 nb with a new top, and the owner is asking 6500usd, is this a good price? Also, I have an mg, and this will serve as a reliable sports car for when the mg breaks. A lot of people say the na is better fun, and I was wondering if there is really any fun difference between the na and nb. As this is second to the mg, I would rather it be little more usable, and that is why I am thinking of an nb. Thanks for replies on the last post, I try to keep up and answer as many of them as I can. Thanks-Eric