I really wish there were more ergonomic keyboards out there. The only one that is viable anymore is the MS Ergo 4000, which, while nice, is not ideal. I would prefer a nice mechanical ergo, but I would also prefer a normal ergo keyboard that was more my style; I never use the zoom slider or most of the other extra buttons on the keyboard. It takes a lot of space for all of those buttons and I would like to buy an ergonomic keyboard that is better, but this is basically the only choice.
I have one of these at work. I switched from the Ergo 4000 to this, and I like it quite a bit. (There's a Mac version, too.) No idea whether it's a crappy keyboard by Atwood's standards.
Beware: there are trade-offs. For the Mac keyboard, you'll want to map Caps Lock -> Ctrl. I don't know what's optimal for the PC keyboard; I run Linux and don't use the Windows key.
Also, neither has a numeric keypad. There's a Numlock key, a la laptop keyboards. I don't miss it but some people do swear by them.
I'm assuming you've also ruled out Kinesis. :) I'm too scared to splurge on one but I've heard they're fantastic.
I run Linux too but the Windows key ("Super" or "Mod-4") is the activator-key for all the shortcuts in my window manager, awesomewm. I also really love numpad and wouldn't spend much money on a keyboard that didn't come with one. :(
Anyone know why we see so few mechanical ergos? I would think keyboard snobs would be wary of RSI...
I sometimes wish there is one with a special arrow button move to the next word instead of next character. Will help a lot with typing and programming.