Try to get some RAM from the Qualified Vendor list as Essenbee says. That stuff is known to work. Other RAM will likely work too, but try to go from the list.
A-Ram brand is completely unknown to me. From the list you provide from your vendor, I would go with Corsair. This one is 1.5 volts:
Corsair 4GB (2 x 2GB) PC3-10600 1333MHz DDR3 RAM - 9-9-9-24 - Performance Solution Product ID: 133606
Re Power supply: Look at my system specs. I have a more powerful Sandy Bridge than you are considering, but my other components are similar to yours (no video card). My system idles around 70 watts and uses under 150 watts at maximum load. Which means even 500 watts is much more than you need. I ran my system for 3 months on a 330 watt Seasonic power supply with no issues at all. I upgraded to a 560 Seasonic only because the 330 watt was aging and was not modular. Get a reliable brand PSU (Seasonic, Antec, Corsair) of 500 or less and you will have way more than you need. A 500 watt unit is plenty to power a major video card if you ever choose to buy one.
Edit: I downloaded your QVL and spent 15 minutes or so trying to match up Corsair, Kingston, and G Skill RAM from the list to something from your vendor's memory stock. I failed. You can try to match up other brands if you want. Personally, I'd go with the Corsair above as it appears to match and is available at your supplier.
That's the problem with QVLs----they normally list only a few of the RAM modules that actually would work well and the mobo manufacturer usually admits as much.