I would honestly say that would entirely depend on what games you plan to play at what monitor resolution. Because monitor determines everything that will go into your tower and knowing more about that will help decide what the best direction to go in is. For 1080P you're probably looking at somewhere between $750 - $900, 1440P you're looking at maybe $1100 - $1500, and for 4K or higher you're looking at $2,000 - $2500 or more.