There are a lot of good suggestions here. However it is what u want. Okay you sound like u are bored with your Miata, do u need to keep it? Good suggestions above are rainy day $$$, travel as u suggest, a house, retirement investments, an MR2?
If it was me, I would sell the Miata for starters. Do u need 2 cars? If not then you can come out ahead $$$ selling the Miata and buying the Mr2. Then u could still travel if that is what u want
Is the Mr2 that much better than a Miata?