I bought FFX when I just started working (by that point, FFX was a Greatest Hits title and cost like 12 dollars at Target), and I wasted a couple weekends on it. That lead me to check out the FF online community, and got me interested in playing the older games as well. So far, I have played through most of the games, though I still have a couple waiting for me on my shelf.
I imagine I would have started with FFVII, but I had a N64 instead of a PS1, so it was Zelda: OOT for me.
Actually, it was Zelda: LTTP that got me interested in rpg-ing to begin with, but that is another story.