This vehicle is hard to beat for the combination of luxury, comfort, reliability and economy. Not as exciting to drive as a BMW and somewhat underpowered, unlike the 07 GS 350, but just as comfortable and more economical. Build quality is legendary, as is reliability. This is my second Lexus and I would not drive anything else.
Navigation, stereo, economy and balance of comfort and performance.
More power (accomplished in 2007 with the GS350). Tighter suspension and less torque converter slippage. This will give it a more sporting personality and make a great car even better.