$120 for the original 1996'ers (according to the scrawl on the sticker) is halfway reasonable. Anytime you can pick up a set of those in mint condition for under $100, I think is worthwhile. That may be just me though. I don't think (also just me) subsequent releases have anywhere near the same value or interest.
The seller needs to be careful what he calls a 'full set'. If he means base cards, the least he could do is make this explicit.
(And, Select, if you read this stuff, how stupid were you not to mint a similarly limited platinum set of the subsequent releases!?!?!. Idiots! )