I'm playing FF X at the moment on the PS2. I like it, especially the skill sphere system. It does seem very linear though, especially with all the cut scenes.
My first one was FF VII, and like you, that game just blew me away, the look, the scale, the story; a real epic. The characters were great too. Definitely the better of the two I have played. There were some incidental things that annoyed me though, like chocobo-breeding. If I hadn't looked at a FAQ, I'd never have worked out the golden chocobo. I have better things to do with my life
I looked at the earlier SNES ones on an emulator, and well, I thought they sucked

I think FF VII was the first one that they put the effort into for a non-Japanese audience, and it shows.