Remember to look into the fine print on that lease. Mileage per year is one of the big items. Also your amount up front on 36 months is probably pretty stiff.
Another opiton is a certified pre-owned car.
I bought my 2001 RX300 in 2004 as a certified pre-owned car and in my opionion that is the way to buy a Lexus. I received 100,000 mile warranty (total miles), new tires, new belts, new battery, basically all items under the hood were new. It had 34K miles on it and it now has 143K and it still looks new. A few minor nics in the paint but overall it looks great! You get the loaner car on servicing if over 1 hour to perform. Right now you should be able to get a 2007 or 2008 as a certified car at a pretty good price. Usually Lexus financing has a special as well on certified cars. I got 3.9% on mine.