Looks more like an '83 as suggested (give or take) than a pre-1980, I've a very similar bike and occassionally enjoy riding it. The bike you've posted is Hi-Steel with average components befitting a slightly below mid-level bike. It's a very nice bike in even nicer shape. Nishikis were painted and finished really nicely, yours is no exception. it has steel wheels which suit the bike fine.
Flandry's Olympic is a level or so up from yours so at $120 his bike was a "better" deal all else being equal. The price seems a tad high frankly speaking. I spent less than that on the one I own. Bear in mind that you've no freight to pay. Just as frankly, I would say that ive spent more on 'better" bikes bikes in poor condition. Prices vary SO much. The bike's appeal and fit trumps all. DO note the serial #, etc. t-mar can ID it further as well as add the particulars to the forums data-base. You could in fact do worse, not a bad choice AT ALL.