I'm a noob too, so I'm going to chime in here as well.
Have had a 57 plate GS450h for almost a year now, and absolutely love it.
Just need to find out how to get some of the more 'specialist' service bits done cheaper than the local Lexus dealer, just quoted me £150 to recharge the Air-con, was scared to ask about the transmission fluid...
Cheers!
Justin.