Budget Build & Learning

I'm working on a build for a budget of roughly $425. I'm right around $430 right now ($500 before MIR). While still looking to cut back, I noticed on two different builds which were suggested to me the RAM was the same size and speed from what it looked to me. The only difference I could see was the brand name, Corsair Vengeance and G. Skill Ripjaw Series... the latter being cheaper. What's the difference if any other than the name and which should I go with?

This is my current build with the G. Skill RAM in it. http://pcpartpicker.com/p/poQv

I'm looking for a nudge in the right direction as well as trying to learn. I'm very new to stuff like this but I'm very eager to understand what I'm actually buying/putting in my computer and what would be the best part to go with. Thanks for any help.