This has got to be the cheapest X99 build ever.
Disclaimer: I have 2 accounts with Newegg, so I used some promo codes twice :)
*CPU: I needed X99 because I do graphic design, among other things. Plus, it's a bit more future proof than LGA1150. Bought at Microcenter for $299+tax.
*CPU cooler: Cheap and reliable, using push/pull.
*Motherboard: I didn't need any of the OC gimmicks and this was the cheapest one available.
*RAM: I should have went with 2800. Regrets.
*Storage: I'm getting an SSD soon; hard drive was cheap.
*Case: Don't buy this case, no matter how cheap it is. Way too small and it took some modding to get the radiatior to fit.
*GPU: Noticeable coil whine.
*Power supply: Not enough ports?
*Windows: Windows 10 FTW