What specifically do you dislike about the standard ones that are available?
Just speaking of Logitech keyboards, for example, I find a fair amount of differences with the keybed "feel" between various models like the MK320, MK520 and TK820 (these have very different keybeds).
Since keyboard feel is so subjective, best that you go to a store and try some out. Is there an electronics superstore near you?
Alternatively, Amazon has a huge selection that you can browse through. Again, best if we knew what you liked/didn't like so we can make some suggestions.