Ano pinaka-expensive na binibili in building a PC?

Hi! Just wondering, if I want to build my own pc na hindi naman for gaming, pang printing shop lang if ever, ano po kayang pinakamahal na gamit dun ang bibilhin ko? Anong price range po? Gusto ko lang sana magbuild for the experience.

Tapos let's assume na I have a monitor na (if that's the most expensive thing na binibili. 😅