Against bigger defenders: I drive hard, stepback and if they don't close out I just splash. If they try to swat me I fake(just a head fake so I can keep my dribble) cross over and go all the way. For smaller defenders I just need two post moves: up&under and one dribble baseline dropstep.
The step back is my bread and butter. Before I dribble I make some fakes. Pump fake, jab step, whatever, to try to get them to react. I'll drive and step back and if they give me the space, I'll hit it. If they overplay I'll keep my dribble and drive past. If they still keep up, I'll then do a spin move near the basket. If I roll past, I lay it up. If I don't get past, I shoot a step back fadeaway out of the spin move. If they are still on me, I'll pump fake that shot and then shoot. or go up and under.
If they didn't get faked out with any of that, then I guess I just get swatted.
That is a sequence of moves that I've practiced over and over and there are a lot of different variations.
In the post it's the KG high release turnaround jumper, sometimes after a head fake, with the up and under as a counter (or at least the first step to my counter).
Facing up Pierce step back is the only move defenders can't find an answer for against me. If I haven't created enough separation with it, I might either drive to the basket (occasionally after a spin) or pump fake, plant my foot ahead of the defender and shoot off the glass (or I'll sometimes do the Wade if I really have no other way, but I don't like it, it's not a very... honorable play, for lack of a better word).
Another move I like when facing up closer to the basket is one dribble and turnaround. Turnarounds are really the main part of my repertoire.
...I just realized I should watch the Celtics more often before playing.
I used to use the step back a lot, but I found out that sometimes if I just take one quick dribble back (to avoid palming, I'd say a dribble through your leg back), head fake I can get the guy in the air, then dribble for the layup.