If price is your consideration you may be out of luck. Of course, you only need a Mac keyboard for some keys, ergo PC keyboards are way way cheaper! I got a Logitech, I managed to get most of teh functioality I wanted without delving to deep, I still have trouble with widget hotkeys & function key conflicts.
even standard mac keyboards are more expensive than ergo PC key boards, macs look lots lots better though!
Anyone ever tried the split side design keyboard? The one that has one half on one side of your chair and the other on the opposite side? So that you type with your hands at your side? I'd love an objective take on that setup.