Out of that list I'd go with the G35 or the legacy. The G35 has 53/47 weight distribution which beats the TL's 60/40. In my experience once a vehicle goes past 55% weight on the front wheels you get understeer mania unless you do a lot of tweeking to the suspension. The G35 weighs in at 3435 pounds and the TL at 3482, so its a c-hair lighter.
The impotrant thing is that the engine in the G35, the VQ35DE if I remember correctly, has a good aftermarket following, and If your so inclined takes well to boost. So you get a great interior, an exterior that is wonderful looking, RWD and the ability to make a lot of power.
The reason why I even mention the Legacy is beacuse at heart I love subaru's and I think it deserves a chance.
My references:
http://autos.yahoo.com/newcars/acura...ecs.html?p=ext
http://autos.yahoo.com/newcars/infin...ecs.html?p=ext
hooray for google.