Expensive, you mean. Motherboard and ram price will probably go down a little bit in the next years, but you would have to wait a really long time. I think ddr4 is expected to be standard in 4-8 years.
X99 and Haswell-E (5820k, 5930k, 5960x) are the "EXtreme" series. If you want the best, you will pay a hefty premium. For benefit only in applications that use 12 threads.
The I7 4790k is what you are looking for, if you want a high end processor, but still take money into consideration. Price/Performance wise, extreme series cpu's are always in the worst spot, while the I7 4790k is in the best for I7's.