I tried the new slim brushed metal apple keyboard, and it hurt my hands after about a half hour of coding. my fingers in particular. Some people have said that it just takes getting used to, but I agree with the sentiment that you should definitely try it for a bit before buying it.
I currently own the tactile pro 2.0, and an older belkin usb keyboard that seems to work with my mac, and actually has a sleep button along with the power button. The only complaint I have with the tactile pro 2.0 is that the cable is actually two usb connectors and therefore takes up two usb ports on my macbook. One is for the keyboard, and the other is for the usb 2.0 dock. I do like the clicky older style of keyboards, but other people generally dont like how loud the tactile pro is, and if you are on the road this might be a concern. Especially on a plane.
I would suggest you check out the icekey, which is a scissor switch mechanical keyboard based on the same technology as laptop keyboards. It is very comfortable to type on, relatively quiet, and should suit your needs.