If you're looking for good performance you need light wheels to reduce unsprung weight and emphasise the handling performance that the tyres are going to give you. Racing-style wheels like that from Enkei, 5Zigen and Racing Hart are your best bet. From there you just need to find the right wheels that fit the size and look that you want. Remember though that while larger wheel sizes will look "better", lower profile tyres to suit will become more expensive, and the wheels will be heavier as well. For the Miata, go for 15-17"x7". The new tyres won't be overly expensive and the wheels will be nice and light as well.
