I have ridden in IS250 & G35 and driven C300.. Currently own and love my loaded e92 335i...
I would reccomend an E90 335i over anything else. I know you said "no mods" but to be honest a simple ECU tune is so easy and inexpensive its hard to rationalize not doing it.
E90 335i ecu tuned to 400hp basically trumps anything in its class (with the same amount invested for perfromance modification)
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