Thanks for quick reply.  We are in Sydney.  We compete in coastal offshore races, and will also be doing the Sydney-Noumea race and around Noumea race in June.  Maybe Sydney-Hobart this year.  For charts, I plan to start with Aus govt ENCs, which will give us coverage for most of our racing. But we will need other chart source for New Caledonia. 

DH, welcome aboard.
I would want a 12 inch screen, no smaller.  With the 10 inch screens (Toshiba ToughBook small size), the screen size restricts the number of Taskbar items and the number of Number Box items that can be legibly displayed.  This gets to be more of an issue when you have a tablet in deck, since those Taskbar icons are all your forecast and weather pages, stripchart, everything else one needs to look at on a regular basis.
I should add my eyes are not 25 years old anymore, that certainly does not assist.

Zee, you are just spoiled ... you need to see what passes for a nav station in a TP.  Not enough height (yep, height) for 14 inch display.  Sigh.  I'd LOVE a bigger display!

In a couple of months I am doing Sydney-Noumea on a Cookson 12 - it has a nav table, nav station and upright seating.  That would mean not wearing a head torch and full wet weather gear when navigating down below!  On the other hand, it does 8 knots upwind ... flat out ....