Surprised Skies of Arcadia hasn't been mentioned in this thread yet. IMO it's better than either of the Chrono games, and has the same sort of charming, light-hearted adventure feel as Trigger.
Valkyrie Profile is also better than either of the Chrono games. It's a shame that it's so rare these days, but it's easily worth what it goes for on eBay. It's funny, with the current big trend of real-time battles in RPGs, you'd think that developers would have made improvements in the methods of controlling a party of characters in real time over the past 5 years. But nope, they haven't - VP is still squarely at the top of the RPG heap when it comes to engaging, visceral real-time combat. The game's got gorgeous artwork and awesome characters too.