go with precision.  my friend does heads there with bob and they do great work,ive seen it first-hand.  ive known bob for years and he is one of the nicest, most helpful people i know.  hes helped me tune my car MANY times for free at his house.  u can trust him.  if there's something wrong he will make every effort to make it right, guaranteed.  he's doing my heads for my car. 
cory