I love my faith. What year are you looking at? I have the 2010 and find it awesome. Stock spec is pretty decent to. Good for trail and FR/DH. It's a real good all round bike.
People here are right and wrong, kona stinks are TERRIBLE for brake jack. However, if you get one with the dope braking bar kit then they honestly do change so much. I've owned both and boy is the extra £50 worth it!
kona suck, they will break and are crappy, the big hit are really heavy and not as playful as some other bikes. without a doubt the giant faith i better than any the other you metioned. is there like a budget or something for the bikes you have chosen?