Have you considered an aftermarket heatsink like the CoolerMaster Hyper 212+ ? It would be a little quieter than the stock Intel heatsink, and it would avoid the terrible push-pin mounting system.
Is the Samsung HD103SJ available for less than the Seagate hard-drive?
Can you get an Asus P8Z68-V LE motherboard instead of an Intel motherboard?
Can you find less expensive PC3-12800 that is on the QVL sheet from the motherboard manufacturer?
i7-6700K, NT06-Pro, GA-Z170N-Gaming5, 32 GiB, 980Ti, SM951, 5TB HDD, Blu-ray, FTZ01, SX600-G, 3007WFP+2001FP, RK-9000BR, MX518