Hi!
So budget up to €2,500, though preferably closer to 2k.
I almost always use it plugged in, with its own monitor, and yes, I use the internal speaker.
A desktop would probably be better, I know, but I travel a good bit for work so I like to have something mobile for downtime in hotel...
My requirements: Don't do a lot of massive graphics intensive stuff - mainly grand strategy paradox games or football manager or the like. Flight Simulator is about as graphics intensive as I get. Nevertheless want a reasonably high end machine that can handle all of those with a bit to spare...