I agree with everything that Big Light has said

Hebrideans would seem to be the obvious breed for your land as they evolved specifically in that environment so can take wet, wind, soggy ground and rough grazing. They are easy lambing - it's unusual for them to need help, they are great mothers, frequently with twins, have plenty of milk and are able to look after themselves and their lambs in the face of many predators. Some people will say they are hard to work with a dog, but several folk who enter sheepdog trials have used Hebs to train their dogs and they are perfectly amenable to that. (Soay are less flockable - it can be done, but yet again we have been beaten today by one ancient old Soay with no teeth and skinny as a rake, but boy can she run

)
Hebs, when crossed, may benefit from using a tup with narrower shoulders than something like a Texel, but unless you're borrowing a tup, remember that he will need to do on your ground as well as the ewes. Look on the Heb website and I think there will be details on there of popular crosses. They make a neat meat lamb, bigger than the dam, usually white unless you have a black dominant animal in there, they should finish before Christmas. Purebred Heb meat is a known niche product which, if you can use mail order, or have a top restaurant in your area, you will find a good market for. Have a look online at the prices some breeders are asking for boxed hogget. Purebred Hebs take 16 months to finish, especially on harder ground, but as you have the use of hill land that would be ideal. They don't need extra feeding, except maybe hay if you have a bad winter, but they taste all the better for no grain.
Crossbred lambs fleece is very often very useable. Pure Heb fleece is variable and something of an acquired taste, but I love working with mine. If you take care with your fleece production you can sell select fleeces to spinners online, or of course you can use them yourself. Skins can be tanned and sold again online, although you could really only use the ones from early finishers sent off in November.