https://www.cftshops.com/pilot-t10mg-compact-tetherable-stylus/ sells a compatible stylus that will fit the Mobilepros.
Screen protector...hate them with resistive touchscreens.
VGA cable...no reason for it unless you want to display a 640 x 240 pixel screen on a vga monitor.
Ethernet cards can come in handy. Most hotels don't use wired ports these days. In times past they were great for travelers. The Socket LP/E pcmcia card sits flush without the dongel plugged in as several others such as the Xirconm. Personally I like wireless cards better.