I am a big fan of the Kinesis Advantage 2's dished layout. I think that's a bigger deal for me than being split. The 2 unfortunately is not split, while the 360 is both split and dished.

The thumb keys are also extremely important, but they're more common among ergo keyboards. I don't think I'd ever buy a keyboard without thumb keys. Thumb keys go great with emac's standard keybindings.

I've spent too much money on keyboards already, but will very likely buy the 360.

There are some DIY keyboards like the dactyl-manuform that also look great. Could be a fun project, but I'm not really looking for more side projects at the moment.