I'd rather cry over a Kingfisher bokken than get something not worth crying over. Besides, has anyone ever seen a Kingfisher bokken break? They have an excellent reputation.
Lan's bokken from Sei Do Kai IS an excellent bokken. I've seen and held it. "It'sverynice..."
It would also be an excellent choice. Given that this is a birthday and special gift, go for the gusto! Get him something kickass!
I feel the need to recommend Bu Jin also. I have been very impressed with every product they have produced that I have seen. They are not cheap, but then again, you're looking for something special, right?
Three excellent choices... you can't go wrong with any of them.
Good luck!
PS: One last thing - there are many choices of "styles" of bokken you could get. Stick with a basic "Aiki" style if you can find such a thing or "Iwama" which is a stronger and more sizable style to use. There are dozens of choices on some websites... I would tend to avoid the really fancy stuff. But that's just me.