Grandia, takes me back. Haven't messed with the first one but now that you just mentioned it I'm gonna go ahead and get it. I've beat Grandia II, and remember my parents getting me Grandia III but after looking at some screenshots and me not being able to recollect ANYTHING about it, I don't know what the hell happened there.
I love Star Ocean 2 though, I know when I was younger I poured about 50 hours into it but can't really remember anything past the first disc so here I am ~16 hours into it again. It was top-notch that you could choose to focus on either Claude or Rena (although it's said you get a tad bit more storyline playing as Claude, and fuck Dias), the private action feature which could you net you interesting story tidbits, alternate endings and some badass items. Like you pointed out, the humor, the happy-go-lucky atmosphere, yada yada.