[GraemeJ]

1 - ........ the tablet is starting to age (general slowness, diminishing battery life) and my eyes are starting to degrade as well. Hence a bigger screen is needed.

2 - Last year I bought an Asus T100 (Windows 8 tablet + dock) as note-taking tool for teaching, and I've since started using that for displaying sheet-music during concerts as well. It works pretty well with the Adobe Reader app (even with bluetooth pedal-support!), but there is no easy way to make annotations on PDF's.

3 - PS Just to prove how much I love using MobileSheets(Pro): I tried running it on the Asus T100 through the Bluestacks Android-software (paid for it!). Worked pretty well, but the bluetooth-performance (page-turning with pedals) was too erratic to be used reliably in concerts.

1 - Couple of alternatives here.  Obviously, buy a bigger tablet . Less obviously, a monitor of suitable size, with HDMI input. Replace the Motorola with a cheapo tablet  - as long as it has HDMI out it will be fine.

2 - You can legally download a free version of Adobe Acrobat 8 Professional.  This runs under Windows 8 and allows you to annotate the PDF's.

3 - You've already been pointed towards DuOS - that works pretty well on a fast Windows machine.