130i all the way!!!! The 1 Series is BMW's best chassis yet (OK, so I hear the E90's supposed to be even better than near-perfection, but I'll give you the verdict on that soon). I drove a 120d and while I was less stoked by the power on tap (But blown away by the torque, being a diesel!!), it is certainly more fun than the 350Z, hence'll be better than the Skyline as well.
Can't forget the new 3.0 Inline Six either, 190 Kw means that the 1 series chassis'll get the engine it always deserved.
Obviously the 1 series is more practical around town and has just as much luxury equipment as a Skyline, so I see no reason to take the Skyline over the 130i, sorry!