trying to find gaming pc information/build 500-600$ range

presently trying to purchase/build a gaming laptop from tiger direct for round 500-600$. I already have a monitor, keyboard, and mouse. i was wondering if I should buy considered one of their pre-developed gaming computer's (corresponding to http://www.tigerdirect.ca/purposes/SearchTools/item...) or if I should still buy the constituents and let them put it collectively (I think they cost quite lots for constructing it for you). The games i might be mainly playing are Cs:go, H1z1, and some MMO's. I have already got a ps4 so I may not should run games like bf4. If a person might provide me some counsel or advised a construct in my funds that could be enormously appreciated.