Wilder, any fish you ever get would be extremely lucky to have you care for them. You are full of information about fish and sicknesses, i know that any fish you choose will be healthy and live a long life, if unhealthy, then i know you will fix it. Betta fish, I find each has a distinct personality. and they seem happy to see you when you walk into the room, even if it might just be for food, it is nice to see them wiggle their bums at you, trying to get your attention. That's what my office betta here does as I sit at my desk.
I think you should go for it and get one, but watch out, it is addicting!