First, join your local league so you are in touch with the natives that might have some games to sell you.
Next, save up what you want to spend, let's say save $3500.
Once you have your budget, you will have great clarity as to what games you could buy.
Having a fixed budget will keep you from overspending.
You should also sell all the crap you have sitting around your house. Sell the RAM from your old computer, sell the car amps & speakers from your old car, sell that bass guitar you have sitting in the closet.