I definitely believe it...there are places over here that way overprice PC parts. At least we have places like Newegg to get good pricing. Wish it was easier for you get affordable parts...it may be worth the risk to get the Silent Pro M
OCing isn't my strong suit; I recommend posting the OC question in the CPU OC boards here: http://www.tomshardware.com/forum/forum-29.html
If it's a pre-built PC, then you may not have enough OC features on your mobo / BIOS for a good OC on the CPU.