CONFUSION OVER A B'DAY GIFT

This is not fair!!!
Its raining b'days for us. The 16th is Db's b'day and exactly after 24 days its mine. Its been simpler for Db, I have a very transparent face, he knows exactly what makes me happy or sad. Also, I have plenty of things on my wish list:

I wanna join swimming lessons.
I want to have a keyboard (musical keyboard).
I have been trying to make a new painting since a long time, my oil paints are finished and I am being so lazy to get a new pack.
My bean bag burst last week and ever since I have been wanting to buy another one.

So you see, Db has plenty of choices.

On the other hand, Db has been moving towards sainthood with a steady pace.
Talk about shopping, and he has plenty, talk about books, he hasn't got the time, talk about partying, he doesn't drive when he even sniffs alcohol (that's fair though), talk about good food, he says "Arrey Dal Roti bhi chalega".
He hates TV, doesn't like watching movies, isn't a great music lover, hasn't got any intrests other than the stock market and investment books.
I am totally blank, as in what the heck should I buy him that makes him happy.

Huh!!! Talk about people who are difficult to please!!! Grrrrrrrrrrrrrrrr!!!