You appear to have a nice stock bike in better condition than most, from that pic.
Strangely, for me, the stock seat doesn't 'suck.' I do have an aftermarket seat, and have been using it lately. I am not an over-the-road biker (long distances) so the seat isn't of much importance, as it doesn't bother me. Some people just have to change it, 'roids or cramps need to be cared-for or eliminated, and there are a couple of the vendors here who have good alternatives-for the seats, not for hemorrhoids! As you age you will come to realize the significance of, "be-kind to your prostate, & it will be-kind to you." (hopefully)
I think that tires/wheels (radials) make the most-profound difference, as I already posted. I agree w/Max Midnight as-to his suggestions, but in a slightly-different order: radials, then brakes, rear shocks, steering head bearings, LI-ion battery, updated regulator/rectifier, typically from an R-1; front forks & valving inserts, that should keep you busy for awhile, and shouldn't drastically-alter your classic appearance. I, too, like a relatively stock-appearing bike.
You don't need to be in a hurry to do anything, if you ride within reason, which you should be doing anyway, until you are experienced in what it is capable of doing, or not doing. On the basis of that valuable personal experience, then you can modify things as you see-fit, to meet your personal priorities. Do lots of reading on what interests you, you will find, someone on-here probably already asked your question, and multiple people here have given their experiences and opinions, like this one.
Strangely, for me, the stock seat doesn't 'suck.' I do have an aftermarket seat, and have been using it lately. I am not an over-the-road biker (long distances) so the seat isn't of much importance, as it doesn't bother me. Some people just have to change it, 'roids or cramps need to be cared-for or eliminated, and there are a couple of the vendors here who have good alternatives-for the seats, not for hemorrhoids! As you age you will come to realize the significance of, "be-kind to your prostate, & it will be-kind to you." (hopefully)
I think that tires/wheels (radials) make the most-profound difference, as I already posted. I agree w/Max Midnight as-to his suggestions, but in a slightly-different order: radials, then brakes, rear shocks, steering head bearings, LI-ion battery, updated regulator/rectifier, typically from an R-1; front forks & valving inserts, that should keep you busy for awhile, and shouldn't drastically-alter your classic appearance. I, too, like a relatively stock-appearing bike.
You don't need to be in a hurry to do anything, if you ride within reason, which you should be doing anyway, until you are experienced in what it is capable of doing, or not doing. On the basis of that valuable personal experience, then you can modify things as you see-fit, to meet your personal priorities. Do lots of reading on what interests you, you will find, someone on-here probably already asked your question, and multiple people here have given their experiences and opinions, like this one.