2014 Prius V want to avoid head gasket problems

It's a gen3 and too soon to tell. You gotta remember that people jump on this site to rant about what went wrong and how to fix it cheaply. While the gen3 is probably the worst reliable Prius line when compared to the other generations - the bar was already set very high.
I would drive it and see; but if someone wants to give you a decent offer - I'd probably take it.

 

It’s already had the inverter recall done

The battery is in good health

Yeah, the brake booster is a $1200 part but can “fail” for years before actually needing to replace it from what I’ve read.

I’ve already put so much into the car (brakes, tires, EGR/intake cleaning, coolant, spark plugs, windshield, struts, alignment, etc etc) and I’ve only had it a month.

Every car is going to have repairs, they’re mechanical and it’s a 2013 with 166k miles. I’m not surprised that work has had to be done. I just don’t want to jump ship just to acquire another vehicle with someone else’s problems again.

 

OK.............. I'm out of here aparently you know more about this than me............... Start saving $$$$$$$$$ for the real pain

 

I'd hang on. You've done the EGR clean, which is not trivial. And you're aware of the possible pending issues. There's head gasket links in my signature, which'll give some idea what you'd be in for, if and when. Even if you opt to use professionals, it's good to know the process.