Can you be a bit more specific:
E.g., what do you mean by "best"? What specific requirements to do you have?
You have provided two requirements: 1) price and, 2) that either n or ac standard is acceptable.
With respect to gaming I expect that you will want to have or to control as much network bandwidth as possible while limiting other network users.
Most home use routers have some measure of QoS functionality. How well and how extensive that functionality is can and does vary with make and model.
The more extensive the functionality the more expensive the router may be.
Go online and visit name brand router websites.
Take a look at the User Guide/Manuals for three or four routers that meet your price requirements. The...