There is one weak point for this set of options -- if you start your turn adjacent to a hard-hitting melee opponent against which you do not already have CA. Your choices are:
1) attack without CA, shifting either before or after
2) attack without CA, then move away, risking OA
3) move away using Ambush Trick, risking OA, and then attack with CA
4) shift and then move away, making no attack at all
5) double move to get far away
Some DMs will allow you to use the CA-granting tricks (Ambush and Tactical) without actually moving a square -- consider it to be bobbing and weaving without really moving much -- but it's hard to imagine a DM that would allow you to do it without provoking an OA.
For that reason I strongly suggest that even Thieves who use Ambush Trick consider taking the feat Cunning Stalker, which gives the benefit of Ambush Trick when adjacent, without needing to use a move action. (And if your DM allows Cunning Stalker to apply at range, you don't need Ambush Trick at all.)
Finally, I have to put in a good word again for Opportunistic Withdrawal at paragon tier. It is amazing when combined with almost constant CA -- far better than anything Artful Dodgers gets.