go with a newer mobo since many newer mobos bios will not boot a q6600
as far as best?
if you want raid stability i would use a separate card - the newer 975/965 chips sets seem to run raid 5 ok - all nvidia chipsets run raid 0 - ok
all are slow
tough question - suggest you narrow your features and do your own research then ask us from which we would suggest and why you picked the ones u did