Rasmus,
I am not really sure why, but my Nishiki is my favourite bike. It is a bit tight in the cockpit, as with most Japanese bikes the top tube is pretty short in comparison with the framesize, but it handles great.
The tube set is Tange Champion. The Competition was top of the range from Nishiki at that time. Mine is weighing only 10.4kg (23lbs), which is pretty good in my opinion for a '78 steel lugged bike. I really like the Suntour group and I prefer it over Shimano stuff, but that is a purely from a technical point of view.
I payed 100 euro's orso for it, so I guess that 150 is in the ballpark, if it is in a good condition.
Good luck!