This ^^ is a Good Call, I'd say. If this is not to be a 'surprise' gift, have him go along and choose for himself. If it is, on the other hand, to be a surprise, see about making a 'virtual' guitar from card or similar for the 'surprise' presentation, and arrange with GuitarGuitar to issue a Guitar Card, allowing the purchase of one ('1'...) guitar from their outlet. He doesn't need to see how much it's costing, if that's to be keep hidden. It would be far better, for all concerned, to have him able to directly benefit from the guidance of a good retailer, by going along and trying them out with their help; the 'nitty gtitty' of the financials you'll be able to negotiate after he's made his choice. As long as they know not to present him a heap of models at over a 'grand', naturally..!
Good luck to all concerned; it sounds as if a splendid occasion is being fittingly feted.