Backlighting is cool, but it's not so much about function as it is style. Backlit boards will let you type in the dark but you shouldn't really be doing that in the first place; it's bad for eye strain. If you want a mech board for the sake of having a mech board that's one thing, but if it's comfort you want I wouldn't rule out the Maxim solely based on it being a rubber dome keyboard. Not all rubber domes are created equal. Topre for instance is part rubber dome. Many years ago I had an Apple Design Keyboard which was a joy to type on, solid as a rock, tactile, and not at all stiff. I went looking for another one recently, and was convinced it used mechanical switches until I found the original product specs proving it used rubber domes. I guess what I'm saying is, some rubber domes are better than others. I've never owned a Kinesis board however they have a good reputation making serious quality ergonomic keyboards; notwithstanding, $139 for a split board is a great value IMO. Split keyboards are among the most ergonomic keyboard designs you can get outside of something like the Advantage.
For gaming keyboards you really can't go wrong with the SteelSeries 6GV2, it's an excellent board.