You'll enjoy either of these cars or some of the others mentioned. However, you'll miss AWD and the ease/comfort of the M340 if you go full M. Conversely, the M is just more special and is the nicer car, albeit dated and on its way out. On the street there is no advantage to the M but if you drive aggressively or go to the track that is different.
Did you like your S5? What about buying it out while waiting for G82 M3 with AWD? Yeah it will be butt ugly but AWD and face melting fast if that's your thing.
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