Sofar im very happy and with SweetFX giving me enhanced graphics Im even happier! i skipped the DLC, i think a game should stand on its own feet... maybe it was a bad choice but meh...
Ah, great. I never played with SweetFX, will do on my next playthrough though. SMAA + Sharpen gives a nice touch especially if the game is jaggy and blurry.
About the DLC, The Missing Link is worth it but it's not necessary. You gain a few details for the story which I think is important but as far as gameplay is concerned, it's decent.