Trying to build a computer and need some help.

This is what I have so far. http://pcpartpicker.com/p/pXJNjX

Some questions I have is...

Is video card necessary?
Is 4x4gb memory better than 2x8?
Is ASUS mobos overpriced?
Don't know much about corsair RM power supply. They good?

Trying to buy some at microcenter since sales may be going on.

Budget: maybe around $1300, cheaper the better
More specific use (what games, what programs): bluray movies, video edits, photography, graphic design
Planned time until purchase: ASAP
Do you need an Operating System?: No
Do you have any specific preferred components?: Intel
Do you need a sound or wireless card?: No
Do you want stock cooling or do you plan on overclocking?: No
Do you need a monitor? mouse? keyboard?: No
Zip code/location? (Shipping costs): 80013

pretty much
2x 8GB is better
not really
get Seasonic like this: http://pcpartpicker.com/part/seasonic-power-supply-ss650km
get a case like this: http://pcpartpicker.com/part/fractal-design-case-fdcadefr4bl

Is the Seasonic power supply that good?

Seasonic is the best...most other PSU companies, at least for their good PSU's use Seasonic and just rebrand them.

yes,
rm is shit compared to them,
i mean cx is shit, rm is shit, etc.etc.
ax isn't cos it's seasonic!