Now, may I suggest: get a good old IBM heavy "clicking and clacking" (I made this up, I know it is not English, don't arrest me! ) keyboard. Ok, it's horribly noisy (well, I like that), it does not have the Windows key (many would appreciate it, here, I guess ), but:

1) It lasts virtually forever
2) It never fails
3) You can actually dismount the keys and CLEAN it (which is an horrible experience, by the way), if you want!

Mine works perfectly every day since 1993.