I've had 2 FUE's with Dr. Ron Shapiro and I'm very happy with my results. I keep my hair cut pretty short (#5 or 6 guard on top) and I think it looks good and EXTREMELY natural. Dr. Ron is known for his naturalness and he's also I think a bit on the conservative side which I think fits in with what you your goals are. There is a phenomenal SMP girl there named Nicole. She is very talented. Honestly, I think if I were you I would start off with the SMP and see how you like it. I think you'd look great with it. The only thing you have to understand is you're going to have to shave down even further. You won't be able to keep the hair as long as you have it now because it will look unnatural (2D vs 3D). Also, people will probably know you did something so I'm not sure if that's an issue with you or not if the know you basically tattooed your head.
If you go the FUE route I think your goal should be to create a hairline and put some grafts behind as well but I do think, especially with thin hair as you say you have, the plan would be to keep it the same length you have it now (maybe a tad longer) but you'd have a hairline and it would look like you just buzz your hair. I think that would be a good look on you but it's going to be more expensive and there will be more down time in healing. I think you'd be looking at 3000-4000 grafts broken down over 2 procedures. After my FUE's, 10-14 days later I looked like I buzzed my head. Nobody could tell, but I did heal really well.
Either way, you seem to have a good handle on dealing with this. Even if you decide to do nothing and keep buzzing, it's not a bad look on you and you've effectively dealt with hair loss in a respectable manner.
Good luck on whatever you choose!