Azazel
You've already been given excellent advice so far, so I guess I'll just chime in with my personal findings.
I've had 2 HT's and about to receive a 3rd (final)
I got those at 21, 22 and for the last one I'll be 23. This makes me one of the most aggressive on these boards, and many people have shook their head.
I started balding a few months after I turned 18. It affected me deeply, as I had never seen anyone at my age losing their hair (and so rapidly). My hair looked just like jude laws here
I got my first HT at a local clinic for 1600 grafts, and the result left something to be desired. I wasn't butchered by any means, but it was clear that if I wanted to get to the bottom of my hairloss, I needed to travel.
My 2nd was with a coalition doctor for 2750 grafts, with a much better result. However, as my problem was not isolated to just my hairline, I wasn't able to achieve acceptable density there. Also, while my crown had responded well to propecia and my hairloss had virtually stopped, it never fully regrew.
My next HT is going to be with dr. Mohmand (no offense against devroye, but I can't afford him once more) and the plan is hopefully to reach 2500 grafts with 1500 to the hairline and temple points, and the final 1000 to the crown. That should keep it at bay for the next 5 years(I hope).
And there's no guarantee I wont turn into a NW7.
If that happens, and I(we) run out of hair there are still some options.
1) Shave down, accept the scar
2) To shave down and fue to scar
3) Conceal the scar
4) Tattoo the scar
5) Laser everything off
6) Wait for hair multiplication
None of the sollutions are perfect and some of them are downright 'last resort'. But those are the terms I've accepted. They also apply to you, so think carefully. Are you willing to gamble?
I can't tell you what to do though. But know that if you choose to do it, you're practically commiting yourself to go all the way.
On a more philosophical note, the more hair I have, the more I stop caring about it. I guess the saying that only proves that you crave what you can't have. But once you get it, you feel sort of silly to have felt the way you did about it.
Feel free to PM me any questions or considerations.