I don't think the K60 is a bad alternative, I've seen it on sale from time to time on slickdeals.net for around 65 usd, it is pretty different from most keyboards because you can see the entire keycap as well as under it off the bat almost as if the silver housing is the PCB. Another small issue is that the extra keys that it comes with wears down very easily, there were pictures in another thread where someone showed what a few months of usage looked like, and the letters looked like they were hit with sandpaper. Also I think the Fkeys are not mechanical and are rubber dome, not 100% sure.
Everyone here loves the QFR since its the cheapest option for a mech keyboard, but the branding on that is pretty ugly, I personally would not get one. It is up to your taste preference and the availability in your country, as well as how much you are willing to pay, there are many more options for red switches, but the prices will go up to around 200 and even more for rarer keyboards.