By "normal" batteries, do you mean AA or AAA alkaline batteries? While there is nothing wrong with AA or AAA, I would strongly suggest avoiding alkaline, particularly if the light will be expensive. NiMH rechargeable cells like Eneloop have the same life between charges as alkaline, do not develop memory so they can be charged at any time, and do not leak. Get a low self discharge chemistry (like Eneloop), and it will retain 75% of the charge after 3 years of storage.
It would be helpful to know something of the intended use of the light in making recommendations. $200 is an expensive light. In my experience, the expression "you get what you pay for" applies when comparing low priced products to mid priced products, but not necessarily when comparing mid priced products to high priced products. For $200 (or likely less), you could get your son a very nice mid-priced light, a Kydex belt light holder, a package of eneloops, and a nice charger.
My recommendation would be to look at the Quark, Mini, and Preon lines from FourSevens. If you decide that you like the Quarks, the Pro interface is better for general utility use, and the Tactical interface is better for "tactical" use.