I have my ISP's second highest internet service at 18mbps, which has upheld just fine, but as I add more devices to it some seem to suffer. So would you recommend upgrading my modem/router or upgrading to their 45mbps service? Ideally I'd like to get the most bang for the buck. The service I have now handles my 4 main devices running netflix and playstation simultaneously just fine without lag and with quick loading, but the smaller devices (phones/tablets) seem to get the short end of the stick. Without spending unnecessary money what is my best bet?