I'm an architect and i need a macbookpro for running CAD progams, Archicad (v9 or v10) mainly. I'm thinking about buy a refurbished 2.2 with 128 Mb vram and added 4 Gb ram. Is it better than a 2.4 with 256 Mb vram and 2 Gb ram? Thanks, Franco. Ps: i'm from Italy, sorry for my English.