$125 for a keyboard ...
I will never know what a mechanical keyboard feels like.. 
Eagler
You can find budget mechanical boards, and there are some that make $125 look like a real bargain. RK (Royal Kludge) is a budget brand that I have had good luck with.
What makes mechanical boards is that you can customize them to feel and sound how you like. Unlike the soulless slop of a membrane keyboard.
Most of mine have obnoxiously loud, heavy, clicky switches, but I do have a few that have extremely fast silent switches.
They come in all sorts of sizes, and shapes. With many different types of switches available, and with the proliferation of hot swappable keyboards you don't even have to know how to solder to change out switches.
