Welcome to the forums, and back to the States.
You posted in the correct forum for what you are preferring which is up to a 2004 Mustang. I think you are on track with what you want. You are considering a car based on looks, cost, condition and repairs, and daily driver.
Working within that criteria place your focus first on condition and repairs. Buying cheap and immediately investing money in repairs to bring the car up to reliability will only work if you buy the parts and perform the labor. If the owner has maintenance records, that's a helps show the level of care the owner gave the car (oil changes, brakes, tires and general upkeep). And that brings me to this point: buy from a reliable used car dealership if not buying from a private party.
Do not focus too much on cosmetics such as faded paint and minor dings. I don't know where you resettled in the States so you know if you need to look at salt corrosion or not. You can do a lot yourself to restore the shine and toss on some seat covers to hide the normal wear and tear.
And don't be afraid to have an independent mechanic inspect the car. That's just a few of the things I personally prioritize and look at. Others will add their comments.
Good luck and hope you get something that satisfies your checklist. Give an update later.
2019 Charger Scat Pack White
2012 Mustang GT, Roush 2300 Black
2006 Mustang V6 Manual Legend Lime Sold
2016 Jeep Willys Silver Vin 060 RIP
2016 Jeep Willys Silver Vin 059 Sold