http://www.kinesis-ergo.com/shop/advantage-for-pc-mac/
I have yet to put my hands on a better input instrument. I'm considering the purchase of a second one.
Supposedly there's a version 2 on the way...
The function keys at the top (Escape, F1, F2, ...), not so much. They're small rubber keys like those you would find on a remote control.
I like that it's small and portable and has forced me to learn to type with all 10 fingers rather than doing rapid-fire with indexes and middles on a regular layout.
I've also used the TEK, which was equally awesome, just bigger.
2. Microsoft Natural Ergonomic 4000.
Symmetrical Alt & Ctrl [or X- & M-] are a requirement. Xah Lee's Keyboard info is invaluable... http://xahlee.info/kbd/keyboarding.html
One of the reasons I bought it was that it was backlit. But now the LED's of a dozen keys have gone out. (This is after one replacement from the company due to the same issue, and I had to pay the shipping charges from my own pocket).
Also, it has a very delicate usb port on the keyboard (Yes the cord is not permanently attached), so after a while you end up frequently reattaching the cord. I have now tied it to the keyboard body.
If you ever find this keyboard online. Don't buy the backlit version. And don't buy then one with a usb port instead of cord being permanently attached.
At work I use Microsoft ergonomic (the new model) with a Magic Mouse.
I used apple wireless for a very long time as well, ended up with fingers hurting after a long day of typing.
I also tried truly ergonomic keyboard but could never get used to the keys layout
I like that it is a very solid build, with a satisfying key press, backlit, and that it has a reduced width (so the mouse is not too far to the right), but at the same time has all the regular keys in the regular places (in the main keyboard section).
[1] http://www.amazon.com/CM-Storm-QuickFire-TK-Mechanical/dp/B0...
At home I type with the Microsoft Sculpt which is the best keyboard I tried to date.
I find mechanical keyboards uncomfortable. Tried MX browns/reds and hated them because of the low actuation force (resting my fingers on the keyboard means accidental key presses so I need to hover my fingers which can lead to injury), MX blues are an improvement but too noisy, MX blacks are very nice but tiring on the long run...
So basically mechanical keyboards were nothing but an expensive fad for me.
1. Lexmark IBM Model M, 1993, Black modifiers from Unicomp, 100%
2. Noppoo Lolita Spyder, Kailh Browns, Granite Keycaps, TKL
3. Poker 3, Cherry MX White, and Granite keycaps, 60%
4. (on order) Planck (MIT layout), Cherry MX Tactile Grey, Black DSA Keycaps, 40%
I plan on giving the Spyder to a friend for Christmas, replacing it with a Novatouch someday. Also looking to build a better numpad, as the last PCB i got was just terrible.
I'm getting the new versions of the apple wireless keyboard and trackpads in a few days and I want to be able to toss them into a tray that holds them the same way that the macbook chasis does. I'm finished drafting a custom tray for it, and I'll be 3d-printing it this week! :)
[1]: http://www.daskeyboard.com/model-s-professional-for-mac/
I'm currently looking at the Das Keyboard or the CODE keyboard.
I also have a Poker and Filco Majestouch 2
I never got the obsession with keyboards, I've been coding for 5 years and I always just use the one that comes with the laptop.
I like the simplicity
At home on desktop: Blank Das silent (also brown switches)
But most of the time outside of work I use my Macbook Air and its standard keyboard.
Mac Mini + Apple Wireless Keyboard
Gaming Rig + RAZOR BlackWidow (2013)
Go through a 4000 every year or so, but they are cheap.