I don't want to spoil a good thing, so keep it between the two of us, but if you can generate/afford $2k US a month, you will live well in Costa Rica.
The thing is that you need to get used to live in a bit of a disorder. I still cannot get used to it sometimes.
Anyway, if you want to live in a "first world country", I cannot recommend Czech Republic enough. It's modern, super safe and still cheap. Plus we definitely need a bit more of diversity there.