I use a standard keyboard/piano bench (#5 in your list) for classical & recording GT lessons.  But I recommend getting and always using a strap for anything except classical.  I even use & recommend a strap when sitting down.  If you ever want to play or perform standing you will need to be able to play confidently & comfortably using a strap.  Using a strap is the best way to ensure proper mechanics & posture if you are sitting or standing.

Most of my practice & playing time is standing, with my standing computer desk if I'm using my computer for the process.  The only exception is classical style & recording lessons.

Hope that helps!