Salsa spent @ $2500 (frame & fork included in that total) on his hardtail build, but I would guestimate that you couldn't buy an equivalent for less than $4K. He started collecting parts last October, made good use of X-mas & his birthday, and completed the build in March, just in time for his 1st race of the year!
His fork & frame were $1200 (the frame was a crash replacement - full price, add $300) - Salsa Moto Rapido, Carbon Lefty fork. He's got Magura SL discs, a collection of CF bits & pieces, scandium seat post, SRAM 0 & 9, etc.
As with mud, life, too, slides by.