Keyboard mapping problems

In addition to the gaming-specific keyboards people have mentioned, note that key remapping is a feature of most modern mechanical keyboards. Unless you're getting deep into the hobby, they mostly have GUI configurators these days, too, making them more accessible than ever. There's no requirement to buy a keyboard marketed specifically to "gamers"; it's worth looking at broader reviews and recommendations, because you'll often find something that meets your needs while being both cheaper and more flexible (or something at a comparable price point but of higher quality).

In particular, I tend to urge people to be extremely diligent when researching "gaming" mechanical keyboards before buying them, as historically they have often used a nonstandard layout for the bottom row, with key widths that differ from most other keyboards. Where a standard spacebar is 6.25 units—with a "unit" being the width of a single square letter key—some "gaming" keyboards have a bottom row built around a spacebar that's 6.5u or 6.0u, with the widths of one or more other keys adjusted as well. (The mentioned Corsair K65 is a good example: on its bottom row, only the Alt keys are a standard width.) This means that if you want to customize the keyboard with a different set of keycaps, most standard sets won't be compatible. At best, you'll need to buy supplemental sets of nonstandard caps (which often won't even have all the keys you need) or look only for sets designed specifically for that keyboard, which tends to limit you to a handful of vendors.