From my years of being a forum member I would say apart from the LS400, which is undoubtedly the best Lexus ever made, the IS250 probably has the highest praise, and actually still looks good today. So I think you've made a great first choice!
There's an interesting thought, in both European Lexus road trips covering about 3.5k miles, I don't recall ever considering the steering pulling. I certainly didn't break down either!!