Yeah indeed I totally agree, in fact i see the same Vengeance kit in Silver at 1866Mhz is the same price as the 1600Mhz Blue stuff (£150). Would the higher speed have any effect on the overclock etc, and would it actually make a noticeable difference?
• It's not going to be slower

• It wont effect your CPU overclock, I have personally used 2400MHz RAMcas10/9 on a i5 4670K at speeds upto 5Ghz without issue. I recently built this rig - http://forums.overclockers.co.uk/showthread.php?t=18575279 - and the 2400MHz cas10 RAM used on that didn't stop 4.5/4.6Ghz easily being done.