the IS is a brick. From what I've been hearing (aka various magazine articles, consumer reports, etc), it's rock solid.
previous generation leases are coming back, so a good price can be found.
I think it's a 200hp, 6, so gas should be around the 25 mpg range
and there are loads of parts for it. It looks a bit dated, but I'm sure the overall ride quality + fun factor should help you get over it.
IS300 =