Strange question to be fair. There is no issue with price since keyboard and mice are cheap. So you choose comfort.
Personal opinion. I prefer a soft key on a keyboard but I can't say I've ever used a keyboard and thought, oh no I'm going to get an rsi with this one...
Get a razor gaming mouse. They nice and user friendly, glide well (if u have big hands). Christ knows what their keyboards are like. Mines from asda and its fine.