£100 to spend - recommendations?

Hi,
I don't drink whisky I'm afraid, but my dad can't get enough of it. There's a special occasion approaching and I want to buy him a bottle of something 'special' as he tends to usully just drink 'cheap' bottles (not usually more than £15).

I know it's difficult as everybody's tastes are different, but I know he does like Aberlour and Jamesons in particular. Maybe something along those lines? Recommendations?

I am willing to spend up to £100.

Any help will be greatly appreciated!

Graham.