What game should i start off with for PS3

I am getting a ps3 in a couple of weeks, and i am not sure what game tobuy for it first. InFamous or Killzone 2? Which game will keep me busy longer?

killzone 2 but i would suggest mgs4 first. its amazing

well killzone has online.. do you like online play? i personally dont like infamous....killzone has a good nline community and like 4 map new downloadable maps and i have to say i never get tired of any of the maps they all are fun i would say valkyria chronicles would be a great choise for a first game for ps3 its a jrpg thats a lil more untraditional with that you shoot people and move your pieces around the map