(!$... or 914
Don't consider anything less.
One of the most important criteria for me when shopping for a car is TCO... That's
Total Cost of Ownership
The 914 will still be worth what it is today in 5 or even 10 years time. Maybe even a bit more.
Of course you have to eat running cost etc but...
If you're using logic only then the 914 is the only one you should consider. It's way more solid than a Miata and therefore safer in a crash. (touch wood)
If you go with your heart then the 914 is the only one to consider.
If you want to look Steve McQueen cool then the 914 is the only one to consider.
Don't get me wrong. I think the Miata is a great car but it's not worth burning money on. End of story...