I have the original Chrono Trigger for Super famicom in its japanese version, even if I never used it I'm glad to have it in my collection. I also own Final Fantasy Chronicles, the original soundtrack, the soundtrack A Brink of Time and that's all for Chrono Trigger (until next month for the european release of CTDS).
For Chrono Cross, I had the Greatest Hits version that I gave to a friend because I didn't want to have that shitty green band to get a copy withiout it. For the same reason above, I also have the japanese version. Of course, the wonderful OST is part of my collection too.
For collectibles, I only have the 3 figures you can find on
this page.
My dream is to get one day the Radical Dreamers music box but, you know...
the price...
And I'm still seeking the Missing pieces and Chrono Cross Square Millenium Collection.