Let's bring the pundits out! (your suggestions sought)

In Spring, 2018, two tremors will shake my automotive world. My daughter will graduate from the mega-bucks private university that has made me eat Ramen for four years. And the lease on my 2015 Jeep Renegade will end. When the ground stops trembling from those events, I will have $12K stashed and will need a daily driver. An A-body or perhaps a C-body will be that car.

Let's get this much out of the way...

Yeah, I know no upgrade will make it as safe as a '98 Civic. Yeah, I know even a solid example that is aggressively undercoated will be toast before three to four years(if that). Yeah, I'm aware of the reliability challenge for a guy who is a dynamite RN but has zero aptitude and experience with a wrench. But look, everyone...I figure the government is going to make us all sit smiley-faced in self-driving cars before too long. I had a ball before my kids started college running about (in succession) in a '64 Dart, a '60 Studebaker Lark, and a '77 LeBaron. I loathe the Jeep and anything built after 1990. I have seven years to go before retirement (six in Spring, 2018). And I have all of four miles to traverse to the hospital I work at. The thought of returning to vintage Mopar sustains me through tough days at work. So, with no further ado, I am tapping your collective experience and wisdom.

I want to find out what would be the first three things you'd do to make it safer and more reliable. I figure on spending enough to get a solid-bodied and solid running number 3 car. Don't mind more doors at all. Probably can't do a 2-door anyway, since that $12K is all I have budgeted to get going, including the car's selling price. I don't get too worked up if originality has gone away like Madonna's virginity. From what I've seen just as a lurker, I already figure on:

1. Converting to disc brakes,
2. Electronic ignition,
3. Better headlghts/3rd brake light (paging Daniel Stern),
4. Boiling out or replacing the fuel tank, replacing fuel pump, fuel and brake lines/hoses/etc.
5. Installing shoulder belts, maybe a seat swap for head rests, Scat Procar or Sebring convertible seats.

You may agree those are essentials.. But what would you consider highly desirable beyond these? I see things like Hotchkis TVS kits and Holley Spitfire fuel injection, and everything looks wonderful! But I dunno! If you are so inclined, give me the three things you would do after what I listed. I truly appreciate all responses.
12 k is gonna get you a very nice A body and I wouldn't be surprised if it had most of the stuff already done to it for that price.

However, if not done, I'd upgrade the cooling system, complete suspension rebuild, and then look into an od trans or even a gear vendors if the budget allows.

Best of luck