Once you are close to spending $800 the Samsung Q1 is by far the best solution. Don't spend more. And unlike the Nokia its not a learning project to load the orbiter (it runs windows XP).
However the Nokia's are selling for less than the cost of the screen and can be made to work.
I would love an install package or compiled binary to install Pluto Orbiter on it.
The Nokia Orbiter is already built. All dependencies except mysql are added to the Maemo extra repository. So, you need just install them, plus libmysqlclient and the Orbiter package. All packages are in the Maemo garage - https://garage.maemo.org/frs/?group_id=162
Regarding Q1. As I know (I can be wrong) it supports stylus only. No finger input.