I would call out two main ones.
The first is Final Fantasy VII. Here in the UK, we didn't get many JRPGs; most of the classic ones never made their way over here. FFVII was a big departure as Sony threw their weight behind it; there were ads for it on TV, in the cinemas, and it was presented as this new thing (because JRPGs kinda were new here!). I actually got the PC version a bit after it came out, and played it end-to-end in quite a short time. I loved it, but moreover, it was followed by many other JRPGs because of its success; it had finally cracked the UK market.
However, another for me was Vagrant Story. I've actually never finished it; I've got about halfway through but that's it, on three separate occasions... Maybe that's why I hold it in such high regard, it's like the proverbial "one that got away". It had such effective storytelling, both visual and verbal/textual.