I'm not familiar with any of those models, but my experience with Nishiki MTBs back in the 90s was good - at that time, at least, they made very solid steel frames - my Dad has a Nishiki Colorado (mid-to-high-end MTB) that he purchased in 1990 or so, and its still going strong as a commuter bike. Their MTBs from that era would make good off-road tourers - long wheelbases, lots of braze-on's for racks, decent 3x7 component groups.