That's an interesting set up you've got there.
I've been considering how I'd go mobile if it became necessary or more convenient.
If money was no object, I'd go the smartbook route: Intel i3 or i5 CPU, dedicated graphics, 11" or larger screen, SDD for fast startup and, if possible, some version of Linux like Mint or Ubuntu so it's extra fast. That would knock the socks off of even entry level laptops. Since there's no moving parts, they're generally very thin and lightweight.
At the cheaper end of the market, I'd go for a netbook: In this department, AMD seem to outperform Intel Atom chips. They're a lot "beefier" to use the technical term ;) than ARM chips although they do use more power. Still, these days, you're never far from a power outlet, and PSUs for netbooks are tiny. Again some version of Linux would make them faster and the better ones have SSDs in them too.
In both cases, almost everything's easily serviceable and replaceable. They're also easily upgradeable (often you can do it yourself). The exception to this in the smartbook category being Macbook Air. You also get plenty of default connectivity with projectors, USB devices, SD cards, ethernet, WiFi, and in some cases Bluetooth.
They're also more secure and have a longer track record against malware and spyware with plenty of 3rd party security and anti virus software available. Oh, then there's the sheer quantity of well developed open source software projects that allow you to do just about anything you could possibly want for free (Of course, we should all donate what we can to the developers and projects whose software we use).
Just my €0.02!