My 'thought' is not about any particular part you have selected but about a new wrinkle in the whole concept of 'build it yourself' PCs.
Counterfeiting is not just for software anymore:
PCWorld article on fakes
More and more hardware is also being counterfeited. Batteries are one of the worst products for this. Consumer electronics and
computer parts are also 'growth areas' for this problem. Maybe you won't find fake CPUs or video cards (yet) since these are very complex and difficult to make, but fake memory sticks, fake hard drives, and other relatively simple parts are getting fairly common. You'd best be very careful in your choice of suppliers for your parts.