Well then... the only real limitation is size... at $150 you can get a very nice light, or even light & batteries & charger.
Personally I carry an Eagletac G25C2 Mark II. It has excellent throw, but with plenty of flood. Good mode spacing too. My only complaint is that it does not tailstand.
I'm not sure who has the best price on them.
Aside from the light, I suggest these batteries:
Link
This charger:
Link
You can use coupon code BLF on Fasttech. Contact doingoutdoor, they will probably give you a bit of a discount on the order also.
This will also work very well:
Link
I think the Sipik is a great value light, but quality with Fenix, Eagletac, Armytek, and Nitecore, is on an altogether other level.
If you want to go a bit all out... and Wow, him a bit... also get him this Skyray King:
Link for $36 with BLF code. You will also need more batteries for it, I suggest these:
Link
Everyone who has not seen a king in action, is usually wowed by it in my experience.