Im trying to build my first computer and need some advice on hardware

  hello im new here my name is jade and i wanted to thanks for your time and help in advance

i have bin trying hard to figure out what is the best and cheapest way to go about building a PC able to handle games like GW2 and other new games

i have put together a parts list from lots of guides and forums but feel i should get some help before buying the wrong thing or paying way to much for something i really don't need to be able to get a good gaming experience with good graphics and no lag and hears the hard part all for less then 1000$ total

what i have is a windows 7 operating system a decent gaming mouse and a monitor i also have a old key board to so i can hold off on buying anything besides the hardware for my tower computer and im assuming the graphics card will be the most expensive i cant seem to find one for under 300$ sadly but like i said i know nothing and that's why im here asking for advice

ok here is my makeshift build that is a little over my budget and im not sure if everything will work together but is a good idea of the type of system im looking for and im wondering what people are thinking of these brands and of someone can suggest a cheeper part or better site to buy the same part on

feel free to criticize or even provide a build i can follow(that would be nice seeing im no good at this)

Case
HAF 932:

RAM
CORSAIR XMS3 16GB (4 x 4GB)

PSU
CORSAIR Enthusiast Series TX750 V2 750W:
or

OCZ ModXStream Pro 700W:

GPU
GeForce GTX 670 whatever brand is best for my low budget the ones i have listed here seem very pricey but GPU is the key for good gaming or so i hear just wit i had more money or the cards were in my price range i feel like a kid in a candy shop) ASUS GTX670-DC2-2GD5 GeForce GTX 670 2GB

or

GIGABYTE GV-N670OC-2GD GeForce GTX 670 2GB

or

Galaxy GeForce GTX 670 2 GB :

CPU
AMD Phenom II X6 1045T:
Mobo(mother-bored) very unsure here
GIGABYTE GA-990FXA-UD3 AM3+(i hear this is good value but how good is it on performance?)

or for a bit more

ASUS Sabertooth 990FX TUF AM3+ DDR3 1800 - 990FX:
and this is a expensive option but i hear ASUS is good but is it worth getting this one over the cheaper ASUS above?

ASUS Crosshair V Formula AM3+ AMD 990FX SATA 6Gb/s USB 3.0 ATX AMD Republic of Gamers Series Motherboard(i like the name at the very least)
well there it is pleas let me know if it will work and if there is anything i can do to make it cost less but still work well assuming this setup would work at all

also am i missing anything in this build or is there a better way to go about getting a cheep PC

any help will... well help keep in mind that i have very little money and 6 cats to feed that's why i cant spend my arm and my leg im saving my leg for the cats   i love gaming and need to be sure ill be able to upgrade when needed

any attempt to help will be much appreciated

and finally thank you for reading and to anyone who takes a stab at helping me build my first PC!

Regards
Jade

P.S. i have little to no clue what im dong and have bin looking at guides,videos and online stores for quite a few hours i have put a lot of time into reading and compairing but still fell like i want/need the help of people who have the resources and knowledge needed to create a computer far better then its price tag says it should be   i hope i did not make my post too long im a little tired at the moment and decided this would be the stopping point for today well for this sleep period anyway(2 am over here in Cali   i need a break)

i would love to learn about how to know about hardware's value also good ways to find parts for cheep and most of all ways i can learn about system maintenance like when to upgrade and how to avoid buying things i dont need or things that could fry my system if i was not careful how i implemented them

to end it off let me say that im clueless to what make's a good computer good besides the obvious more money = better build i now that but what i want to know is what i can do with less money

i hear that this is a good time to invest in building a PC   this is good news for my wallet indeed!   now if only i knew where to find the good deals and what they looked like i would be ready to roll