Building a pc

This is wishful thinking.

The human eye can only see 60 FPS, anything beyond it won't be noticeable

I've never been able to get satisfactory results with $600 rigs. That's just me personally.

That's gonna be really tough then.. I'd definitely recommend saving up some more in order to build a higher end computer that will last you longer and run games you may want to play in the future.

^, yeah. it kinda is x.x

That's incorrect. I know a ton of people who will know the difference when playing FPS games at 60 fps and at 120fps. Heck, some people can tell the difference between 200fps and lower fps numbers.

Wrong, the human eye can see more than 60fps.

Definitely with you on that one. It'll be satisfactory but only for a while. It won't last in the long run which is why i've recommended the OP to save more money.

what is stuff are you looking for do you need OS monitor etc?

if you tell me i will try and make you a good build