Having owned both.
Having done a trip to the ring in an RS2k as well as a daily
Having driven 110miles a day for 6months in the 306

I can't honestly understand why anyone would pick an RS2k over a 306.

The only benefit the RS has is the front seats.

The 306 is simply awesome and in the real world is simply incredible and on track another world.

RS2k is wank in comparison.