What sort of boy is he?
would he appreciate a nice sefer with easy to read english, very relevant and inspirational about 3 min of reading a day, and about half your budget, leaving room for something else as well?
depending on where you live.....
purchase price about a third of your budget, then possibly more for shipping.
I've given it to numerous chassanim, the ones i gave it to were modern litvish / yeshivish and they all really appreciated it. - its a chabad sefer.