Don't get the el one, some people have had mixed results
the only change to the neo one was the plug connector, i've got an r33 one in my neo and it works really well (best highway consumption of 9.6l/100km with the a/c on)
Just order the vulture motorsport one from here now: http://www.skylinesaustralia.com/forums/topic/368412-new-nissan-skyline-r33-o2-oxygen-sensor-59-ph/
And it will be waiting for you when you get home