I know there are plenty of BMWs in motorsport but you will find a great community and a lot of resources surrounding the MX-5.
The cost different to service, repair, and modify would be notable too I'd reckon.
Still prefer to see you in a Nissan, even if it is NA.
Side bar, S15 Autech track only from auction? Cheap as chips... newest car you'd get in that price bracket?