The Infiniti does nothing for me, I am tempted by the Acura, I feel like Honda can sometimes capture some magic in their cars, though it being a new model means it's likely out of my budget. The IS350 seems like it could be a compelling drive, though a bit more vanilla than the Alfa and the Audi.
I will spend a couple days driving them all to see what stirs me after time behind the wheel. I am not in a rush, which is good as I want some specifics on the vehicle, 1st thing is color. Blue or red are top choice, all of the cars I'm interested in come in a *fantastic* bright blue, Audi has a good red, and Alfa does too, of course. The lots here are full of white/silver/grey/black, none of which do i want....unless a compelling grey with a red interior pops up.
I do prefer the S4 mechanicals, the S3 is a FWD biased system (Haldex) while the S4 has a more rear-bias system in it. Audi must churn out way more S4s, used prices on the 2 cars, despite the $10-15k difference when new, almost evaporates on the used lot. Shame though, the S3 is the perfect size car for me, the same size, nearly, as my old A4.