If you are going to buy a mechanical keyboard, realize that they come with different key types that have very different feels to them, which is why people like them. Research MX cherry switches and understand the differences between Red, Brown and Blue switches, then go try them to understand how you want your keyboard to feel. Then look at the manufactuerers offerings with those keys focusing on the shape of he key tops, backlighting options if you want, etc
expect to pay $100-$200 for a decent unit, though you can find some refurbished models and open box models FTTT.
I'm shopping myself, if I can ever find the time to go test drive the different flavors.
Marc