You'll need to tell us a lot more about your system (motherboard especially) in order for us to assess what processors could be used.
MSI Z270 Tomahawk (MS-7A68) Main board
16GB DDR4-2132 1066mHz
Been contemplating Intel i5 7600K
Well, with this motherboard, you have plenty of choices...
Here is a comparison of the features of the Core i7 and Core i5 processors that you can choose from: Intel® Product Specification Comparison https://ark.intel.com/compare/97144,97183,97150,97123,97121,97184,97147
Hope this helps,