hi,
i was fortunate enough to test all three variants. The prices do justify the equipment. Just my opinion:
If all you want is to get into a Lexus, the base is just fine, it has most of the electronics, including leather seats, but serious / keen driver should get the sports, it will leave you with a grin every-time! (but no leather seats). The Sport-Lux are for those who wants best of both worlds - if you can afford it this is the model to get! A sports with "option pack" will already set you back $76500, at $78k for the sports lux with everything - can't pass it. Also as the Sports Lux has only 17" wheels, get the dealer to "upgrade" for you to the 18". With 18" 255/35 tyres, sure you will "stick" to the road...........heeehee.
Also, if you are not in a hurry to buy one, prices will drop in a years time...........hahahaaa!
:D