Hey guys and gals long time lurker first time poster, I currently own a 2007 20" imac. It is the 2.0ghz model with the 128 mb 2400 ati card. The question I have is would it be a worthy upgrade going from what I have to the top model imac (3.06ghz with gt 130). I get a 17% off company discount so the price is below $2100.00. I just don't want to waist money if I wont notice a difference. I use it to play wow, make hd movies and edit in lightroom often.