Welcome Mark, I bought a 2007 SC430 as a daily driver about 6 months ago.
I have always bought new well equipped cars and so it was a big change for me. I do have the use of my wifes car, a Suzuki Swace Hybrid which has proved useful in bad weather or for family travel.
It is a thirsty beast and has limited space in the back or the boot, but putting that aside it is without doubt the best car I have ever had and makes me smile every single time I get into it. They have an incredibly high specification for their age but I do miss parking sensors, rear camera and the ability to steam music from my phone. These can all be sorted if required (at a cost)
I have never regretted buying mine but my feelings are buy one with a good service history and the best condition you can find, irrespective of age or colour.
I have also found Lexus Leeds have been really helpful and would encourage you to acquaint yourself with them.
Regards, Anthony