Sorry but can't help with the various upgrades, but I can say that the LS is the best luxury car for the money. The fit and finish is now legendary as is the reliability. They are fast, quiet, comfortable and reasonable to run (given the size and wieght) but they do depreciate like a heavy stone in water. Test drive various models and buy the best you can afford and you will be pleased as punch everytime you drive it. I am. :D :D