Only just seen these. Very Nice Tim, your car looks soooo much better.
Just to fuel the wheel weight argument, I have forged Compomotive MO's on the Cossie and these are extremely heavy. They are designed for rally use though so super strong. I also have a set of Mag Alloy Forged Speedlines with slicks and these are superlite. The slicks also save alot of weight.
My Works are heavier than my GT4's but alot of this is down to the tires being heavier. 18kg for Rays is very light and even if you do find a 19 that light the tire is certainly going to be heavier.
PS: New Tokico D-Spec Suspension going on this weekend...