Yup - It's a "keeper"
The work done recently adds up all at once, but it's all "normal" maintenance for the age of the car.
Most of the failures we hear about are on Higher mileage cars, and we ONLY hear about the ones that break! (as a rule) NOT the ones that keep chugging along....
There are still Escorts out there running the same engine.... Haven't seen 'em ALL by the roadside... (grin)
If it DOES go, it can often be repaired fairly inexpensively, IF you can pull the head yourself & take it in for reconditioning.... And from what you've fixed already it sounds like you could do it!
The GOOD thing, is that the SPI is the most economical Focus, you pay for that with a bit less performance, but a LOT of folks are happy with them...