Definitely Char's Gelgoog, then. It's not the one I had as a kid, though.
I did have this one, though:
http://www.hlj.com/product/BAN71693
I wish they still sold these around here. I could not give less of a shit about the related media but the mecha themselves I've always thought were quite cool.
Do the prices here include costs of shipping? I would buy the shit out of this:
http://www.hlj.com/product/BAN946732