The SSHD boots in 16.5 seconds, the SSD will save you 0.9 seconds (15.6).
I have two SSDs and 2 SSHDs in my desktop, but I wouldn't look to spend money there until after I had a 4690k, 16GB 2133 or better, SLI / CF of at least 970's and a very good cooler.
I currently have i7 4790k, 16 gb gskill 2133, asus maximus 7 ranger and gainward phantom 970. i currently have cooler master seidon 120v as my cooler so if i buy a ssd you will not have money for a better cooler. So you see my dilemma