I just put together my first PC build and I need to get a WNA. I was thinking about getting a USB one to put in the back of my PC. I was at my local Best Buy and found a bunch called N300, N600, N900, etc. when I check my internet speed on my laptop it says 72.2Mbps, so will the N300 be more than good enough? Because the adapter spec says speed up to 300Mbps, its talking about the same speed right?