My favorite episodes include:
You included my three favourite episodes and the other was good too.
This is probably my second favourite Trek series--after the original.
Little Green Men had elements one feel to the original show-especially the episode Tomorrow is Yesterday, and some feel of the good parts of Escape from the Planet of the Apes--and overall was fun
Having someone from the worst episode of TOS (in my opinion) appear in one of my favourite DS9 episodes was also cool. (Charles Napier--in case you were wondering)
Trials & Tribulations told an engaging story without rewriting the original episode or history--it either happened alongside it or intertwined with it (The Tribbles being tossed out of the storage compartment & landing on Kirk was a great touch)
This episode respected the original and didn't need to detract from the original which I felt like TNG did at times (Especially in First Contact)
It was fun, told an engaging story & had drama all its own, and some nice touches of humour--which ST at its best does.
The Magnificent Ferengi title obviously refers to The Magnificent Seven--which they borrowed from in a good way.
The building of the team and the things that went wrong added humour & suspense.
And Iggy Pop as a Vorta was brilliant