Essays can (and have) been written about what keyboards to buy.

It's very easy to spend $100 on a keyboard that isn't very good; moreover, you won't necessarily know, because most keyboards aren't very good. It's also very easy to spend $3-400 finding the right keyboard, because mechanical keyboards—and you should get a mechanical one, unless you go with Topre—are all subtly different from one another. That's why I now have four.

A keyboard lending library might be a good idea; unfortunately, it appears I'm the library.

If you don't want to spend the time on research, though? Get a Unicomp keyboard. (Do spend the time on research.)