5BGN. You need N for speed, and B and G for range and compatibility with older devices.If you still have any devices that only use B or G and you use them a lot, you will probably want to replace them (or upgrade their wireless cards) to something more modern. Slow devices using the network heavily gobble up valuable airtime. Contrary to popular myth, leaving B and G enabled on your AP is not harmful, and in fact it helps even your most modern clients stay connected at long range. Having B and G devices on your network occasionally is not a big deal.