Jay,
Hey, congrats on representing the LS400 crowd amongst the IS200 modders!
Who is planning to clean your wheels, yourself or a valet company?
Multi-spoke designs (like Beemers have etc.) may look very flattering, but are a

to clean every week. Much easier to clean are 5 spoke designs.
You will also have a chance to see more of the calipers (if they are painted). Check out my bling bling posting in the general lexus discussion area to see some examples of big wheels on modded LS400s...
Good Luck!
Maneesh