If you only have 6 Mbps I’m sure you feel like you have a relatively slow connection. Buying a faster router will not increase the speed from your Internet provider. Buying a faster router only helps if the router can not handle the new very high speed services now available such as 100 Mbps or faster. Almost any router made in the last 10 years can easily handle 6 Mbps. Unless your current router is malfunctioning, your best option is to get faster service from your ISP first.