UserBenchmark, CPU comparison:
http://cpu.userbenchmark.com/Compare/Intel-Core-i5-6600-vs-Intel-Core-i5-7600K/3514vs3885
The build with new parts (Q1 2017) (541$)
GIGABYTE GA-Z270N-WIFI (rev. 1.0) LGA 1151 Intel Z270:
https://www.newegg.com/Product/Product.aspx?Item=N82E16813128982&cm_re=gigabyte_z270n-_-13-128-982-_-Product
Intel Core i5-7600K Kaby Lake Quad-Core 3.8 GHz LGA 1151
https://www.newegg.com/Product/Product.aspx?Item=N82E16819117728&cm_re=i5-7600k-_-19-117-728-_-Product
Cooler Master Hyper 212X:
https://www.newegg.com/Product/Product.aspx?Item=13C-000X-00037&cm_re=cooler_master_212-_-13C-000X-00037-_-Product
Fairly cheap compared to the other build, but worth it? (336 $)
MSI H110I Pro AC LGA 1151 Intel H110 HDMI SATA 6Gb/s USB 3.1 Mini ITX:
https://www.newegg.com/Product/Product.aspx?Item=N82E16813130929&cm_re=msi_h110-_-13-130-929-_-Product
Intel Core i5-6600 6M Skylake Quad-Core 3.3 GHz LGA 1151:
https://www.newegg.com/Product/Product.aspx?Item=N82E16819117562&cm_re=i5-6600-_-19-117-562-_-Product
The PSU and GPU are already bought and owned.
PSU is Corsair RM550x for both builds:
https://www.newegg.com/Product/Product.aspx?Item=N82E16817139144&cm_re=corsair_rm550x-_-17-139-144-_-Product
GPU is MSI GeForce® GTX 1060 3GT OC:
https://www.newegg.com/Product/Product.aspx?Item=9SIA1N84X99251&cm_re=msi_1060_gtx-_-1FT-0009-00008-_-Product
Case is Thermaltake Core V1 Mini ITX Tower Case for both builds. (43$)
https://www.newegg.com/Product/Product.aspx?Item=9SIA2F84EA0391&cm_re=thermaltake_v1-_-11-133-260-_-Product
RAM will be 2 x 4 GB HyperX Fury DDR4 at 2133 (87$)(Or something better depending on motherboard)
https://www.newegg.com/Product/Product.aspx?Item=N82E16820104532&cm_re=hyperx_fury_ddr4-_-20-104-532-_-Product
Will the budget PC most likely be obsolete within the next 4 years?
http://cpu.userbenchmark.com/Compare/Intel-Core-i5-6600-vs-Intel-Core-i5-7600K/3514vs3885
The build with new parts (Q1 2017) (541$)
GIGABYTE GA-Z270N-WIFI (rev. 1.0) LGA 1151 Intel Z270:
https://www.newegg.com/Product/Product.aspx?Item=N82E16813128982&cm_re=gigabyte_z270n-_-13-128-982-_-Product
Intel Core i5-7600K Kaby Lake Quad-Core 3.8 GHz LGA 1151
https://www.newegg.com/Product/Product.aspx?Item=N82E16819117728&cm_re=i5-7600k-_-19-117-728-_-Product
Cooler Master Hyper 212X:
https://www.newegg.com/Product/Product.aspx?Item=13C-000X-00037&cm_re=cooler_master_212-_-13C-000X-00037-_-Product
Fairly cheap compared to the other build, but worth it? (336 $)
MSI H110I Pro AC LGA 1151 Intel H110 HDMI SATA 6Gb/s USB 3.1 Mini ITX:
https://www.newegg.com/Product/Product.aspx?Item=N82E16813130929&cm_re=msi_h110-_-13-130-929-_-Product
Intel Core i5-6600 6M Skylake Quad-Core 3.3 GHz LGA 1151:
https://www.newegg.com/Product/Product.aspx?Item=N82E16819117562&cm_re=i5-6600-_-19-117-562-_-Product
The PSU and GPU are already bought and owned.
PSU is Corsair RM550x for both builds:
https://www.newegg.com/Product/Product.aspx?Item=N82E16817139144&cm_re=corsair_rm550x-_-17-139-144-_-Product
GPU is MSI GeForce® GTX 1060 3GT OC:
https://www.newegg.com/Product/Product.aspx?Item=9SIA1N84X99251&cm_re=msi_1060_gtx-_-1FT-0009-00008-_-Product
Case is Thermaltake Core V1 Mini ITX Tower Case for both builds. (43$)
https://www.newegg.com/Product/Product.aspx?Item=9SIA2F84EA0391&cm_re=thermaltake_v1-_-11-133-260-_-Product
RAM will be 2 x 4 GB HyperX Fury DDR4 at 2133 (87$)(Or something better depending on motherboard)
https://www.newegg.com/Product/Product.aspx?Item=N82E16820104532&cm_re=hyperx_fury_ddr4-_-20-104-532-_-Product
Will the budget PC most likely be obsolete within the next 4 years?