Whats your reasoning for the X99 platform? A Z97 would work just fine and save you some money unless you are doing some hefty CPU intensive stuff and/or need a boatload of memory.

Also WD Cavier Blues are trash, I'd get some WD Blacks instead. Swap out the SSD for some Samsungs, Crucial or Intel. OCZ have kinda been prone to failing in the past. No idea if they got their act together or not now

Honestly, unless you're an early adopter and money is not an issue, I would wait a few months for DDR4 to mature and its price and the mobos that support it to go down. Even a month or two could see your overall costs go down a few hundred dollars.

I don't know what you're currently using for a mechanical hard drive, but as long as its a 7200RPM SATA drive with something close to the 1TB storage you're looking at, just pull the one you have now from your old PC, and put it in your new one. The standard for PC homebrewers nowadays is to use the SSD for the OS and most commonly used applications, and the mechanical for storage, so unless your hard drive is small and/or IDE, re-use of your current drive would be my advice. Back in the day when we'd RAID 7200 RPM HDs for performance, upgrading from one to another might make sense, but with 7200s as storage and SSDs for the OS/common applications, it's less critical.

No reason you couldn't re-use your current optical drive either, unless it's IDE or lacks DVD-R/RW ability. Personally, I'd rather pony up the $20 just not to have to deal with the annoyance of an IDE ribbon cable and get something with a SATA connection instead. But if you're using a desktop, and bought it in the last several years, it should be a SATA DVD-R/RW drive. Some PC manufacturers are a pain in the arse with proprietary fronts on their optical drives to match their proprietary case stylings, making it impossible to re-use, but if your current drive is the standard format, just re-use it.

With regards to where you purchase your components, I'd just go NewEgg all the way. You might save a buck or three shopping around on various websites on this component or that component, but with $10,000 in purchases from NewEgg since 2003, I can personally vouch for their return policies and warranties. There's a damned good reason NewEgg is #1 and has been since early last decade. You'll save yourself a headache if something arrives DOA or dies prematurely.

edit: agree with Rain on the OCZ. They have a pretty bad reputation for bricking. Samsung has the best SSDs on the market AFAIK, but I currently use a Kingston HyperX myself.