[knacky]

How is your current setup limiting your development ability? It sounds like you're spending money on hardware hoping it'll make a big difference. This is like amateur photographers buying the best camera and lens assuming their pictures will suddenly be amazing.

If your current setup is powerful enough to develop I'd build on it. (1) Get one large LCD. (2) Buy a laptop stand and use your laptop screen as your second monitor. (3) Buy a good keyboard and mouse. (4) Get a powerless USB hub for the mouse and keyboard so you only use one of your laptop's USB ports.

If you primarily use Ubuntu, consider wiping your Windows partition and reinstalling Ubuntu as your primary OS. When you need Windows just run it within a virtual machine.

I would only develop on the laptop. If you need to host get a dedicated server for that. You may want to buy a hosted server and let them deal with the maintenance and uptime. Hosting on your development machine will eventually cause you headaches.