Classic Doctor Who- The Best of the Best?

I'm trying to convince my wary stubborn dad to watch some good old Classic Who with me. But he's rather stuck on the New Series (which is what we started with) and hard to win over.

Come on, fellow Whovians. Whats the BEST classic episode for converting him gently over??

Thanks!

My list only includes ones available on DVD right now, my choices (in no particular order)

1st Doctor: The Aztecs
This one shows early on just how good a drama Dr Who can really by. Cheap sixties sets, dialogue worthy of an Oscar.

3rd Doctor - Inferno
Another worthy drama piece - and we get to see a parallel universe for the first time. All the regulars are at their very best, and the story-line is a real cracker.

2nd doctor - see entry further down for the 6th doctor.

4th Doctor - Any episode by Robert Holmes is a must, but for my top choice here:

Genesis of the Daleks
Sarah-Jane, Davros, Daleks and and Tom Baker at his best in a story with a lot of Nazi-ness. What's not to like?

5th doctor - The five doctors.
The plot is stretched to the limit, there are way too many people and it's all quite unbelievable. Yet here it is - all the doctors at the time under one roof, Richard Hurndall's replication of William Hartnell is amazing, seeing all your old favourites get together is the main draw here - good fun and lots of memories.

6th doctor - The two doctors.
The last episode featuring Patrick Troughton (in living colour!). All the in-food jokes, the spanish location, "servalan" from blakes 7, peri (keep your eyes above the neckline dad) - and a rollicking good story about cannibalism - yes definitely a good one.

7th doctor - Ghostlight.
The first time i saw this (with all the lights turned out) it absolutely freaked me out. This was the last episode actually made (and 3rd last shown) from the classic series. It showed the possibilities of where the classic series could have gone had it continued on into the nineties. The plot is jam packed, and and leads are are their wittiest. Time for a nice cup of Java.

For me its
WH - An Unearthly Child, The Daleks
PT - Seeds of Death
JP - The Daemons, The Sea Devils,
TB - Ark In Space, Pyramids of Mars, Horror of Fang Rock, Key to Time
PD - Th Visitation, Resurrection of the Daleks
CB - Only like the Big Finish Audios
SM - Battlefield