Please, please, avoid DVD camcorders like the plague. They are horrid inventions.
First off, you will typically pay a premium for the discs.
Secondly, they often don't work as you think. For example, with my dad's one you have to "close" the disc, which means you cannot write anything more to it, before it will play in a DVD player or allow you to rip to PC.
Annoying if you just recorded five minutes.
Thirdly, you may well need special software to pull files off
Finally, they offer little to no advantage in terms of size over miniDV.
Either get a miniDV or a solid state (eg SD card) camera.
If he is into sports such as mountain biking or snowboarding then
this is an excellent SD card camera. Most places seem to be doing them at about £250, but I have seen them for £200 and less occaisionally.
I would also factor in the cost of discs / tapes vs SD card. With an SD card camera you buy a card or two then keep re-using them (Copy data off onto computer at home). This makes Total Cost of Ownership lower for SD card cameras. Also the camera I linked will connect via USB to pull the files off.