Look for a board with cherry mx red if you want light switch. They are linear and you will be able to spam them. But going from a M you might feel they are "too light". The best is to try them. But as far as speed goes, I don't think you can get much faster. Also, even if cherry switches have travel, I think it's an advantage and if you ever want to reduce this travel you can still add some o-rings to reduce it.
As for keyboards choices, there's many options out there, but you can start by looking at the quickfire rapid, corsair k65, filco tkl, ducky tkl etc.