Good keyboard on a budget for a programmer?

I'm looking for a mechanical keyboard for programming, because I'm building a second setup next to my other setup. I'd like something which sounds nice, looks nice and most importantly: feels nice.

• Budget: €100
• Size: 75%
• Other: Color: Gray or black, Material: don't really care, wireless: yes, layout: ISO, prebuilt/diy: don't really care, it actually seems fun to build a keyboard myself

I hope you can help me!