Not sure on my full list, need to really do a rewatch as I haven't seen most of the episodes since they originally aired.
I have a real soft spot for Gridlock, I'm pretty confident with that one
For classic, oh boy, maybe Remeberance of the Daleks? I wish I was more familiar with old Who
For #3, quite possibly one of the Moffat's stories under RTD, I have a soft spot for End of the World as well even if objectively it's probably not one of the best