I will be using it 90% gaming and the rest watching videos, internet etc.
The games I want to be able to play without any 'lags' or framedrops is : Dota 2, Guild Wars 2, Starcraft 2 and perhaps other games around this quality.
I'm not toooo worried about the graphic quality of the games (I wouldn't mind playing Starcraft 2 on medium settings, as long as it doesn't have frame drops and is smooth). I think the games i want to require relatively less graphics quality. In other words, I dont need to play games on the highest possible resolution settings, just average quality with complete smoothness is perfectly fine.
Most importantly, I wont be overclocking.
I randomly put together something from looking at articles/posts.
The website I used is www.pricespy.co.nz
I live in New Zealand.
TOTAL $NZD 1359.15, equivalent to around $1100 USD.
If possible, could you replace any unnecessary parts(?). Hopefully I want to reach the $1200 NZD mark, although it is not essential ,I wanna be as cost-efficient as possible, although quality over cost.
And also, help me on which OS I need to purchase (I'm clueless about computers)
An i5 3550 saves you some money and the performance difference will be unnoticeable
A Z77 board has the best features but since you wont overclock and presumably wont want two graphics cards then an H77 board will give you the exact same performance
The antec 300 is a great gamer case but lacks modern features . Get the 300 TWO instead since it has much better cable management and front USB 3 ports [ check your mb has a front USB 3 header ]
Set up the SSD as a cache drive . Your mb manual will tell you how to do this
RAM should be rated 1.5 volts or less . The kingston 1600 MHz 2 x4 gig kit is a really good price and its higher quality binned memory chips . You can run it at 1333 MHz and low timings or run it at 1866 MHz at 1.5 volts
The gigabyte gpu cooler is the best of the lot . Good choice .
You will only need a 500 watt psu to run this build .
On pricespy you can filter search results . The H77 chipset doesnt allow you to overclock and doesnt let you add more than one graphics card . its a budget model , but if those features are not important to you then why spend more .
This would be my choice from a quick look at the options http://pricespy.co.nz/product.php?e=1165799
SSD's wont improve in game performance , but they will speed boot and game loading times . They make your computer feel much snappier . They are not essential , and if I had the choice of a better graphics card or an SSD Id chose the grapjhics card every time
The windforce cooler is on the gigabyte graphics card . It works well and is relatively quiet .
If you look at other model graphics cards you will see other types of coolers used . Some are loud , and some dont work as well . The gigabyte is the best IMO