I would buy ram from one of these three companys:
(just plug in your specs, they'll give you options)
CrucialKingstonCorsairThese are reputable companys that stand behind their products. Also,
check out the info on their sites. There's a lot of good info about ram,
definitely worth the read.
Some additional info on ram:
There are such things as cheap , ninety day , or generic RAM, which is actually sold, and doesn't
meet the minimum standards of the
JEDEC (Joint Electron Device Engineering Council), for
use in computers. But it is still sold, and un-informed people, still buy it.
RAM can generally be divided into a few classes:
(Excepting Performance or Overclockers RAM, which is made to the highest tolerances)
Premium or Lifetime Warranty: This RAM is made from Identical chips, all tested and meeting the
assemblers standards, all from the same chip manufacturer and lot. The capacitors and resistors
are of the highest standard, and exceed the JEDEC standard, and all are installed on a circuit
board which is thicker than required . The final product is tested to confirm that it is stable at the
rated speed.
One Year Warranty: Very close, but may include memory chips from different batches, although
still the same manufacturer. The circuit board tends to be at least one ply thinner, and the
resistors and capacitors may have more variance. These still meet the JEDEC standards, and
are tested to make sure they are stable at the specified speed.
OEM: These are intended for sale to a manufacturer, not for resale, although they often are sold
retail. Often if you buy two sticks, you will find that they have memory chips from different
manufacturers. They still meet standards (the chips are certified to meet the manufacturers specifications),
but are often yet another ply thinner, and once again, may have more variance in the tolerance of
resistors and capacitors, and may use fewer, than on higher quality RAM.
Generic or 90 Day RAM: This is the lowest quality you will generally encounter. Often these are
made of leftover chips; ones salvaged from returned and failed RAM, RAM designed to run at a
higher speed which failed and became unstable. They are put on really thin boards, which do
not meet the JEDEC standard. They rarely have even the minimum number, and quality of
resistors and capacitors, recomended by the JEDEC .
Also, if you touch the RAM anywhere except the edges, you should know that the oils and salts in
your skin are corrosive, and will eventually damage the ram. And if you touch it without
observing anti-static precautions, you can cause damage which may show up immediately or
somewhere down the line.
This is why I always reccomend that you spend the extra money to buy
Quality Name Brand RAM with a
lifetime warranty. I also prefer to buy all RAM at one time when possible, and at a minimum, make sure it has
identical specifications (easiest method, make sure it is same manufacturer and model).
If there is something, I left out just let me know. Thanks in advance! 
EDIT: Yes CGM3, Those 3 links : Custum Built, etc. do not work. Thanks for your trouble. When you have the time could you see what you can do?