Dr who fans help me out please? Tom baker episodes

[fuzzpig]

I have no knowledge of the old stuff but I know DH still firmly maintains that Tom Baker was the best ever doctor. So I thought I might get him the DVDs of his episodes but I've no clue which ones, which series etc and obviously can't ask DH.

Can anyone help please?
I found The Key to Time box set but presumably that's not all of it?

He did 7 series in all so there are a lot to choose from.

[[http://www.amazon.co.uk/gp/aw/d/B000NVI2C4/ref=mp_s_a_1_1?qid=1385469058&sr=8-1&pi=AC_SX110_SY165
]] This was his first story, but wouldn't know what else to suggest, there are so many!
I can tell you which ones are my favourites if that helps