Braid or the Da Vinci disappearance?

right, i've just got 4200mp and im deadset on buying portal and limbo but my problem is i am really confused whether to buy the dlc (the da vinci disappearance) for ac brotherhood or to buy braid, browsing online they both get pretty good reps and i just wanna know everyone's opinions + if you have any better idea's share them. also what would you suggest spending the remaining 600mp on? thanks guys/girls.