User manual (PDF)
Netgear Router Comparison
It's interesting to note that the comparison chart states 300Mbps, but the manual states 145Mbps.
Regardless of either "rating" you'll probably never see these rates unless both the router and NIC are from the same mfgr. To get closer to the theoretical rates, you'll need a dual band router and run in 'n' mode only at 40hz. I don't believe the n300 has those capabilities though.
So what's wrong with 65Mbps? How fast is your internet connection (the tier speed from your provider - 10, 20, 30 Mbps?)
You might want to check Meraki Wi-Fi stumble
r to see how many neighbors are on a specific channel. In the US, most automatically select 1, 6, or 11 - changing the channel might give you a better signal. Pick a channel one or two away from the least crowded. It isn't going to be magic, but you should see some improvement.
Edit: I use the Asus RT-N53 (~$60), it's bigger brother RT-N56 (~$110) is a gigabit router with 2 USB ports. Both are dual band. I had an issue with their firmware, but just backed off to the previous level and everything is good. I'm only getting between 36 and 72 Mbps (3 floors up from the router) but my internet speed tier is only 50 Mbps - so I'm more than happy with the performance.