Derek's Classic Doctor Who's What To Watchathon?

Ok fellow Whovians - I need your help as to what to see. You see I claim on the whole to be a well rounded Who-Boy who is fond of all Doctors and all era, but I have yet to watch several of what are considered Who's finest hours (and maybe not so finest). As a result I am intending to look at the numerous DW DVD's I have acquired over the past few months which I have not had the opportunity to view yet, pick some Season or Theme of stories I have either never seen all or wholly all of and see it from start to finish in however long and sluggish it happens to take me, and then probably stick up a few words on here about how I'm getting on.

BUT I NEED YOUR HELP TO PICK WHAT TO SEE! Because it would be fun that way.

After examining the options I have picked three possibilties, so I need you to choose from the options below:

• The Silurians have often been called one of my favourite monsters and despite some bashing by some of their recent return I found myself enjoying The Hungry Earth. That being said I have never actually seen their Classic Who appearances - Doctor Who and The Silurians, The Sea Devils and Warriors of the Deep - so it is possible I could change my mind over that. I have heard the readings of the first and last by Caroline John and Peter Davison though so I do know the overall plot of some. Usefully there's a boxset with all their stories in, so it easy enough to watch them all through, both good and bad.
• The Key To Time - a whole season of Tom Baker I've never seen! Plus could Mary Tamn ever replace Lalla Ward as the Romana I grew up with and loved? Probably not, but it would be fun to see all of this set of stories as the Doctor searches for the mysterious Key To Time via the White Guardian. Again this is all in a boxset so it's nice and easy to watch.
• Lastly is the Last of Classic Who - all of Season 26 to be precise. Sylvester McCoy is one of those incarnations I'm trying to get into and so I nabbed all of his last season - Battlefield, Ghost Light, The Curse of Fenric and Survival - with Ace over the latter half of last year. Fenric, Light, Morgan, the Master with yellow eyes... I've heard of it but never seen it. Is it time for me to be rrrrrolling the r's? Let me know. 

What is the verdict then? Decide down below in the poll and if you can be sure to add a comment and let you know why you've picked the way you have. I'll be deciding over the weekend sometime so let me know by then! :)