I'm building a PC and my mobo doesn't come with built in wifi so I'm gonna need a network adapter, but how do I know which is best? I went to Best Buy and found some that said N300, N600, N900 etc but I'm not sure which to pick. Idk if it needs to be compatible with my modem or what but I have a Motorola SBV5220 SURFboard cable modem and if I check my wifi status on my laptop under speed it says 72.2Mbps so I'm assuming I won't need to pay extra for a 300Mbps WNA as I'll be limited by my connect anyways. Again I know nothing about this but that's just info that might be helpful for adapter suggestions