I'm interested in what keyboards everyone is using.
10 key-less? (AKA no NumPad)
I like the idea. For gaming having a little more room for the mouse (I use very low DPI). No number pad would center my keyboard with my monitor. I use both the number row and numpad so getting used to no numpad shouldn't be to bad. Some games use number pad keys. I could Re-Bind or using a separate numpad for those occasions.
Mechanical?
The only mechanical keyboard I had use was an IBM so old it didn't have a windows key. All I remember is liking it. Cherry seams to be the long time standard. a cAPS lOCK kEY WITHOUT A STEP OR RELIEF BETWEEN a DRIVES ME CRAZY. Aftermarket key caps seam to be redily available for cherry switches. These aftermarket caps don't sound like they fit Kailh and Outemu switches well. Logitech Romer-G has a completely different cap interface. I like the tactile click of Blue and Brown Cherry switches. It would seam any of the mechanical switches bottoming out sound can be dampened with o-rings.
3. Back lighting?
I've had Red back lighting on my keyboard for a long time. This was some of my reluctance in buying a mechanical keyboard years ago (mechanical keyboards with back lighting is a relatively new thing)
Wired or Wireless?
For me I use wired at my desk. In my living room wireless is obviously convenient.