yeah I'm sort of torn on the sale. Part of me is happy its gone since it sat so much and I stopped enjoying driving it a year or so ago, but I also know NB2 is one of the better choices for what I think I want to still try to do.
I still have mine, haven't put a lot of effort into selling it, mostly because I don't know what I want to do next. I do think I at least want something with a back seat. That way I can put a car seat in it.
Given your location I'd watch out for rust. Miatas are tin cans and rust easily. Other than that just look for obvious signs of abuse. They are low cars so some underbody scrapes are normal, but ones that lived a stance life will have demolished undercarriages. The biggest mechanical issue are typically related having been over heated. $4k should get you a decent stock one in need of some minor TLC.