I can only give my bedroom DJ point of view.

Q1) When you go to see a PA, what do you expect?

A: I would expect a mixed set in the style of the DJ who is performing it BUT with the addition of a personalised heavy touch, say: a) a track remixed live + samples, loops, bits n'bobs b) intros, outros, voiceovers, tongue in cheek references

Q 2) When you go to see a PA, do you want to hear orginal tracks (ie the exact same tracks on the vinyl you buy) or released tracks put together on a mixing desk as best as possible, or would you prefer it all remixed and made different, or tracks you've never heard before?

A: I'd love to hear a bit of everything, it all depends on the structure that the DJ/producer wants to give to the performance. So, a well known original track with a surprise intro and an added new killer bassline or hook; or a never heard remix full of character (Brazil - techny latin rythmes - they might either love it or hate, depending on how is done).
No probs with tracks never heard before

Q3) How would you want 'The Anxious' PA????

A: I'd like the performer to enjoy what he/she is doing, being confortable and confident (therefore without trying to be too clever and/or different or trying too many tricks) and playing the set in a way that would maximise his/her character and style. I'd not be too interested in seeing he/she mixing on 6 decks with one hand and preparing dinner for 8 guests at the same time.
Personally I'm not a great fan of trancey keyboard sounds.