I would never suggest generic memory to anyone, even if they are not overclocking. For reaching higher memory speeds, less DIMMs is better. However, with only one DIMM, you cannot enable 4-way interleave. This settings boosts performance a good 5% throughout a broad range of applications without forcing your hardware to run as far out of spec.
The chip manufacturer is not the only thing to consider. The company that packages the chips onto the PCB is just as important in terms of maintaining signal integrity. I suggest buying Crucial memory. The prices are good, they use Micron chips, they use 6-layer PCBs, you get a lifetime warranty, and you can order directly from the company with free 2nd day shipping. For extreme overclocking, Corsair is your best bet. They used to use Samsung chips, but now I beleive they use Winbond chips. Corsair memory really likes aggressive timings. Of course, you are going to have to pay a premium for Corsair memory.