Hey Derek,
Seems to me that if you have done regular PM on the car then why not keep driving it until you get the new car itch so bad you can stand it anymore. First thing you need to do is find an unaffiliated Toyota dealership and have them do the work as their attitude and quality is often better than the Lexus places. Yes, Lexus has better coffee but...
Of course it it was me and I depended on the car for secure travel or business, AND if I could afford something newer, I'd be all over that right quick. Clean yours up and roll it while it still has maximum value.
Welcome to the LOC. I have found this to be the best place to discuss Lexus and other car stuff with people who aren't trolls and idiots. Certainly hope you hang around as we all learn from each others experiences.
Denny