Borders I think would be worth a look too personally as I havnt spent any time there but presumably just like an extension of North Northumberland
I'd say the borders is better than North Northumberland in a way, dead nice scenery around the Hawick / Selkirk / Galashiels area and a right hidden gem of Scotland as all the head up to Loch Lomand etc.
Plus you have places for shopping etc rather than having to travel miles.
Google Maps - Typical of the A7 between Hawick and Selkirk, for example.