If you like laptop style chicklet keys (you may not), Microsoft's new sculpt ergonomic keyboard is pretty nice. I replaced my natural 4000 with it recently and

If you like laptop style chicklet keys (you may not), Microsoft's new sculpt ergonomic keyboard is pretty nice. I replaced my natural 4000 with it recently and found it much nicer on the mushiness scale. It's pleasantly clicky, but not cherry clicky. It even fits in a bag much better due to the detached numeric keypad. The mouse seems a lot better than the one that came with the 4000, enough for me to overlook the lack of extra buttons compared to my logitech G500. My one gripe is the positioning of the period key seems just a little off, something that has taken a few months to get used to hitting without miskeying. Edit: incidentally, this keyboard, despite being fairly new, only gets 5 or 6 keys on the rollover test at the top of the article