The GS is a fast, fun car with loads of safety features and luxury. The mark levinson 14-speaker surround sound system in my 06 GS 300 awd is amazing. This car is well worth the price, especially given the Lexus/Toyota reputation for reliability. And fuel efficiency.
Lexus came out with a GS hybrid model for 2007, the GS 450h. Other models for '07 are the (V6) GS 350 and 350 awd, and the (V8) GS 430. In '06 models included the (V6) GS 300 and 300 awd, and the same (V8) GS 430.
The waiting list is long for a GS. I'd be surprised to find one in a Lexus showroom.