What is the best rubber dome keyboard? (Please do not say Topre)... What is your experience and which one would you suggest?... Looking for a cheap full keyboard for office use.
If
I were looking for an RD board to use regularly, I'd track down one of the RD variants of IBM Model M made in the '90s.
They look like regular Model M's, but were designed for places where keyboards had to be quiet (e.g. hospitals). You can identify them by their part numbers, which start with "7". I think the most common one is 71G4644. Others are 70G8638, 71G4634, 71G4643.
IBM had very high standards in those days, and the IBM "Quiet Touch" Model M's are generally considered among the best RD boards ever made. Even those that have been typed on for years are generally in fine shape—unlike most RD boards made today, which quickly go soft and are unpleasant to keep using. (Microsoft's Natural Keyboard 4000 is a great example of that... Before I rediscovered mechanical keyboards, I used to buy a new MSNK every month, because they never felt as good as the first couple of weeks you used them!)
You're not likely to find a
new one for under a couple hundred dollars, though.
If you're patient, though, you should be able to find a used one for under $100 (assuming the seller realizes it's an RD variant, and hasn't priced it like a standard "clicky" buckling-spring Model Ms, which are worth considerably more). You can then clean it up (lots of instructions on how to do that here) so it looks and works practically like new. It'll last much longer, and be much crisper and nicer to type on, than any cheap new RD board.
If you don't want to bother restoring a vintage board, my other suggestion is a
new Unicomp "Quiet Touch" board, a slightly scaled-down version of the original IBM RD boards. Unicomp was formed by a group of Lexmark (IBM) keyboard employees who took over the factory when IBM stopped selling mechanical keyboards. They redesigned the Model M (including the RD variant) to be more economical, so they could keep their prices down in an age where most people were happy to type on $10 membrane boards.
A new Unicomp RD board is currently $104—but if you want an excellent, satisfying typing experience, and want a board that won't start feeling mushy a few weeks after you start using it, that's a good way to go.