I suggest you should first visit motherboard-specific forums to determine which brand of memory seems most compatible with the memory controller on your board. It's not a quality problem - it's a compatability problem - some boards don't play well with some memory.
I bought some Corsair TWINX 3200C2, which everyone agrees is excellent quality memory, but it wouldn't run error-free above 207MHz with 2/3/3/7 timings on my 8RDA+. The cheaper memory in my sig system, from a lesser-known vendor, just beats the snot out of the Corsair - in my system. Don't make a similar mistake.
Be careful about how you interpret memory markings. The memory in sig system is marked CL3, but it runs 2/2/2/5 timings to 222MHz and 2.5/2/2/7 timings to 230MHz. Unless you plan to run FSB higher than 230MHz, the CL3 marking means nothing.
Do your own research, and buy once.