hello, i want to buy Imac,but i have an indecision,which Imac to buy(it will my first mac). one side , imac 20 inch have a big Hd,screen but just 1GB other side Imac 17 inch have a small screen and small Hd but i can to buy 2GB . my uses are :internet/games(Pes/NFS),music and movies and photos(no pro ). my questiones are : if 1GB be enough for my uses? what are you buy? the Imac 20inch with 1GB or Imac 17 inch with 2GB?