Filco has the best build quality. Ducky is good for backlit keyboards, but because of some limitations, it's build quality is worse than the filco. QFR is a good beginning keyboard. Especially for newbies. You should probably get one and then save the money for your next purchase. Keyboards are a journey to find what fits you best, and even if you do the research, nothing can beat trying out the board in person.
If price isn't important, and you find the QFR is worth it, there are a lot of things you can sink your wallet into, like korean customs, ergodox, and other more exotic things.