I like the dialogue-system in TOEE quite a lot. If a roll for a skill, let's say bluff, will be (or was ?) successful, then another dialog-option appears - a yellow line which looks - apart from the colour - like any other dialog-option, except it has a small symbol in front of it indicating that a bluff could be successful. Same goes for lying, intimidating and so on.
Much the same as Neverwinter Nights. I vote for that: full descriptive text with added options based on skills. The best parth is strength can be just as useful in a conversation as intelligence making people want to try other characters.
