What old Dr Who is good?

Having watched the first two seasons of the new Dr Who I find myself wanting something I never thought I would: to watch old Dr Who.

But (having watched a lot of it as a kid) I know there's a fair chance I won't like any given plot chosen at random, so which stories would people recommend? I know there's a bunch of Old Skool Dr Who nerds who read this, and hopefully are in a mood to evangelise :)

My local video store has these, any of them worth watching?:
Timelash
Sea Devils
Revelation of the Daleks
and the Silverians
The Sontarian Experiment
Wariors of the Deep
Time Flight
Arc of Infinity

Any others I can look up on Quickflix, but it's not as convenient. I did find a few "best of" lists online I might use, I definitely want to watch the Douglas Adams ones again. And yes, I've seen "Curse of the Fatal Death" :)

Also (and I know this sounds silly) the other night I had a dream I was watching a Dr Who episode where he's lured into a trap by someone who wants to use the Tardis for something nefarious, and realising this he leaves the Tardis somewhere safe in the right time-period and travels the distance another way (in this case, by spaceship) Has that ever happened? I realise one of the Tardis's main points is that it's impossible to take over from outside (as much as anything on Dr Who is "impossible") The plot of the dream was a total rip-off of "The Impossible Planet", really.