I really like the 67g zealios. I'm also curious to try the following: Kailh Heavy BOX Burnt Orange (though they're currently out of stock on NovelKeys), Zandas (Zealio stems in Panda housings), though I don't want to spend the money and time, MOD-H, and Halo Clear and Halo True (or whatever they'll end up calling the replacements after the dust settles with the I:C/MD drama). I guess if you like tactile some of those might also interest you.
The Zealio 78g are also nice. I was afraid they'd be super heavy, but the difference is not all that dramatic. I do slightly prefer the 67 though.