Portables are great but there are some down sides.
1. Keyboards are never as good as those on a desktop.
2. If you spill coffee on it you are in deep trouble.
3. Desktops easier and cheaper to repair.
4. On a desktop If you don't like the keyboard or screen, just change them
5. Expanding/upgrading portables not so easy
5. Portables more prone to damage & theft.
6. Working on a long project on a desktop is easier than on a portable.
My advice is keep your desktop but buy a laptop with integrated WiFi. Integrated WiFi has better range than using a WiFi card in my experience. Get a Wireless modem/router but use a cable to connect it to your desktop. You will then be able to access all your desktop files from your portable.