My favourite keyboard would be something with IBM Model M Buckling Spring.
Cherry green or blue or brown (clickless) would also do. ;-)
But I guess that won't be easy.
Actually I can't stand most Laptop keyboards today. First it is this chiclet build, the keys don't feel right, there is no tactile feedback, they are not concave - so the finger can't rest in them, travel distance is a matter of taste maybe. But then even more horrible: the layout. I grew up with my standard European (German) 102 layout. But then, all of a sudden, came Windows keys. In on of the worst places possible: between Ctrl and Alt which I use very often. Then keyboard vendors thought it was a good idea to place a PowerDown key right under the del...PgDn block. So you would accidentally hit the key 25 times per day. And so on.
I see that the place on laptops is limited but I don't see a reason for tiny cursor keys, not separeted. I don't see reason for 10 windows and multimedia keys (even replacing F1...F12, so you can't Alt-F4 without messing around with keyboard drivers or special hotkey switching), but the lack of a second Shift or Ctrl key.
And every laptop is different.
I never had the joy to have an IBM(!)-labeled Thinkpad (keyboard) of my own, just guest wise. They were quite good. But I noticed that Lenovo did a switch to lower quality.
So whatever keyboard it is, keep to classic and sane layouts. And when it has some tactile feedback for typing that would be awesome.
I think a keyboard is one of the main I/O parts and thus most important, regardless what you do: writing or gaming and thus it should be of good quality.
But I don't need to tell you that.
