It's my first PC build and it's for gaming.

 

The first one is one I made after lots of researching a bunch of stuff:

http://pc.ncix.com/pcbuilder/index.php?action=getprice&id=4124706&platformid=1000

 

And this one is one that my local computer store is recommending compared to the one above (he doesn't think I need a heatsink other than the built in one):

Intel i5-4670k Haswell processor with Intel heatsink

Intel DH87RL Haswell motherboard

EVGA GTX 660 Ti Graphic Card with 2 Gb DDR5 memory

Gigabyte onboard network card and Integrated sound card

Microsoft Windows 7 Home Premium 64-bit operating system

Western Digital 1 TB Black hard drive (deduct $25 if you go with blue drive)

Crucial 128 Gb M4 CT128M4SSD3 solid state hard drive

8 Gb Kingston DDR3 memory

Thermaltake case (red front as you viewed in the store) plus Antec 650-watt power supply

Two year hardware warranty

Nice set-ups, very nice.

 

I'd be amazed if an in-store set-up was cheaper/better value than one you've research and built yourself based on internet prices. However, there doesn't seem to be a huge difference between them - best advice is to compare the more important features, simply google "x vs y", and benchmark test results.

+1.

 

Also it's always better to get a heatsink since it really cools the processor down much more than the one that comes with the processor (usually).

I prefer the suggested build

Save 50.00 and build it yourself. It's not hard.