I was in the same position as you, but tomorrow I am finally going to collect precisely what I was looking for.
It took the best part of a year and eventually settled on a 07 SE with 44k in what I can only describe as a time capsule.
The car was sourced from a lady in Leeds who used it for about 3k a year with FSH from the local dealer. I had to see and pass many ropey examples, but that is the name of the game.
The IS250 auto is a dying breed and to find one in almost new condition is a task and a half; luckily, I have more time this year after changing to work from home. The previous owner replaced the example I found for some awfully grey electric VW, which I think will probably sit in the same garage next decade.
There are many people who could afford the Lexus brand, kept them hardly used for years and now switching to EV's meaning more good examples are coming online, so keep an eye.
My criteria were to have a stock car without the useless infotainment system. I can't tell the difference between the ML stereo and the stock Pioneer, so this made it easy as I excluded those from the search.
Pics to come soon.
I paid 6k in total which is ok for a minty car.