Looking for wireless ergonomic keyboard

[EnterTheWormhole]

I'm currently using the Microsoft ergonomic Wireless Natural Multimedia Keyboard for about the last 6 or 7 years.

I've loved this keyboard since I've had it and it still works great.

But I plan on building a new computer soon and figured I'd upgrade the keyboard as well.

I was going to get the microsoft wireless ergonomic keyboard 7000, but for some insane reason they are going for over $300+ on ebay

Microsoft has a newer wireless ergonomic keyboard out call the Sculpt and while it looks cool and can be had for $66 for just the keyboard or around $80 with the mouse as well, I'm not sure I'm totally in love with the new design and would almost prefer the 7000 versions still I think.

I've tried looking online without much success in trying to find another company that makes wireless ergonomic keyboards?

Does anyone know of any other contenders to Microsoft's line of wireless ergonomic keyboards?

It must be wireless & must be ergonomic. Back-lighting would be nice, but I wouldn't choose that over my first two requirements.

Looking at Logitechs line, I'm really surprised they don't have any type of ergonomic keyboard.

The closest things seems to be their Wave Keyboard: http://www.logitech.com/en-us/product/wireless-wave-combo-mk550?crid=27

Does the Wave offer any type of ergonomic similarity?

I do like how it's encrypted... and also not microsoft lol

Do wireless keyboards work/function better with bluetooth or RF?

 

[Pain]

I just remodeled my my Man Cave workshop into a theater and big screen gaming room and was in need of a wireless KB and mouse. I purchased MK550 combo and ended up returning it because it was not responsive enough for gaming and I personally did not like the feel of that KB(the MS Ergo KB feels much better and natural imo...)
I ended up buying a Logitech G602 wireless mouse(which is flawless for gaming) and a 6' USB extension for my KB but I'm still searching for the right wireless keyboard.