Went with this in the end: https://www.overclockers.co.uk/showproduct.php?prodid=GX-199-EA
Will let you know how it goes.
About the booting 'issue'; when does the display appear? At the login prompt or at desktop? Would I need to be able to enable automatic logins if it's the latter?
You get a black screen until you need to log in. Not much of an issue.
Do let us know how it goes for you.