I wouldn't expect my employer to provide anything but a decent quality membrane keyboard and a middle of the range logitech mouse by default. Then people who prefer higher end hardware can ask for an upgrade.

I'm typing on a 300 euro keyboard right now but I would consider it a gross waste of money if a company decided to give them to every single employee regardless of need or preference. For instance for most people better chairs and desks would be a vastly better investment, ergonomy-wise.