Wow I have a lot to respond to, I've been out of town.
I did go drive a 745Li, it actually is nowhere near as firm as the old 740iL, they've smoothed the car down a lot, its a much more ride biased car than it was. I drove it back in 1998 before I got the LS400. It rides well, but it doesnt do the vault deal like the Lexus does. That isn't neccisarily a bad thing though, I like to try new things and I'd really like to have had a BMW or a Mercedes in my lifetime.
I didnt like the styling of the 7 series either at first, but it has really grown on me. I think its a really unique car that makes a statement, something nothing else really does right now.
I'll most likely stay with Lexus, I love my LS400 but I just can't get excited about the styling of the LS430, I think mine is a much more attractive car. The 430 gets a refresh in September though, and some of the drawings I've seen have promise so we'll just have to see. I agree that the dealer experience at Lexus is the best.
I like the drawings I've seen of the new Audi (which is also supposed to lose some sport) but I've had a bad experience with VW over my wife's Beetle, I'll definately consider it though.
As for the S500 (someone said that it was the best out of the group) I for one don't see how. Its a pretty car, but its everywhere (LS430s and 7s, A8s and Jags are much more rare here, everyone has an S Class and they all look alike) it has reliability issues and some material quality issues (although these have improved). Most of all though, its OBSCENELY expensive. You're looking at $95,000 for an S500 equipped like a $70,000 LS430 or a $77,000 745Li. I just dont see anything about the car, other than the hood ornament, to command the price difference.
To people who said they couldn't justify spending so much for a car, I used to say the same thing. I am however in my car for the majority of the day driving back and forth, I travel a lot on the road, I spend more time in the car probably than anywhere else, so its worth it to me to shell out the money to have something comfortable and special. Plus I lease and can write all the payments off my taxes, thats a huge deduction. I'd be looking at around $1100 for the LS430, $1250 for the 745, and $1400 for the S500, I have yet to price the Jag or the Audi. With the current setup at the office they'd probably pay $700 towards it.