I just bought a 2004 LS430.... max options... sticky price around $72k.. I also added the XM Sat radio option.... retail = $1500. The dealer didn't have the car I wanted, I got lucky and they found one in shipping (still on the boat) and I took delivery 3 weeks after we made the deal
I know it's a 2004 but I got them down to $66,700 plus taxes, title, etc. I'm very pleased.
My guess, I could get a 2005 at least splitting the delta, i.e, around $69.5k with the Sat option.... In my $66.7k offer, I gave them $1000 for the radio and $400 for advertise dealer fee.
Good luck
Mark