money is not the issue, buy him somehting personal.
for example neclase,bracelet with engraving on.
photo of you both taken in a special place/happy occasion.
get him a day at the spa, followed by favourite food [home cooked or outside]...
give him a special personal treat[in the bedroom] in the morning un-expected..
organize skydiving for mim and some friends [its available in doha approx 500Qr per person, group of 8 minimum]

give him something "manly" women like sweet romantic, men mostly prefer action stuff...

see what suits his personality best
good luck