Welcome Valduck! You should consider the Streamlight Twintask series of lights, as they have BOTH Xenon and Led in one light, so I guess you can't go wrong there!
Here is a link you can go to check out a review. Price range should be well within what you're willing to spend. The 3 AA version should be good, as the batteries are common and cheap to get. The 1L or 2L (Lithium CR123 cells) are brighter, have a longer storage life but are more expensive to replace. However, many links here on CPF will show you where you can get cheap Lithium batteries anyway...
Else, to really impress him, a Surefire G2 is cheap and really bright for its size. Downside is that the Lamp assembly might be more expensive to replace, and it uses Lithium batts as well.
The rest of the lights that others have mentioned earlier are pretty good choices too, by the way, just depends on your choice...
Good luck, and tell your b/f he's a lucky guy, I think many of us here wish we had supportive g/fs or wives who would actually buy us lights!! /ubbthreads/images/graemlins/icon23.gif