I think I'd rather see the Guardian trilogy because we've had such a surplus of Tom stories appearing this year. No less than 11 Tom stories in one year, so I think it's only fair to give a different Doctor a bit more spotlight, though I do hope we see another 4 or 5 Tom's next year. If we can have 3 boxsets this year, 4 if you count the Davros one - I don't see why they couldn't release E-Space, Trial and Guardian sets next year.
I think top of my list right now would be:-
The Chase - don't know why it gets such bad press, it's a good fun runaround, and I hope they can get any Beatles issues resolved
The War Machines - a cracking Hartnell and early prototype of the UNIT stories
The Ice Warriors - would love to see them animate the missing episodes, though that doesn't seem to be on the cards now
The Dominators - I love the Quarks, I think this is much better than it's given credit for too
The War Games - a bit too long, but worth it just for the trial
Doctor Who and the Silurians - my favourite first season Pertwee, and one of my favourite monsters
The Peladon stories
The Sea Devils - same reason as Silurians.
Planet of the Spiders - pretty much same reason as you.
Terror of the Zygons - Zygons! Need I say more? Really, anything from this season, but especially -
The Seeds of Doom
The Deadly Assassin - another classic.
The Invisible Enemy - first K-9!
Nightmare of Eden - Tom at his most outrageous, I seem to like a lot of stories that people think are rubbish!
The Guardian Trilogy - especially Mawdryn Undead. And for Nyssa in that short skirt in Terminus!
The Twin Dilemma - because it's an important story - even though it's crap!
Trial of a Time Lord - some bits of this are genius, some bits are awful, but I'd love to see it released soon.
Time and the Rani - another story which I think it maligned but I actually feel is the most traditional story out of season 24, and it should get a good extras package.
Silver Nemesis - again, should have a brilliant extras package.
But at the end of the day, as long as they keep the release rate up, I'm not too fussed because I want everything.
Just halfway through Arc of Infinity at the moment. I watched Time Flight earlier in the week and didn't think it was anywhere near as bad as people generally say.