nooby here . .

hi all noob here, i own a 1966, 88" on a classic rangy chassis, 3.5 efi running lpg on 33/12.50r15's, i call it the pork chop express, just for ****s and giggles, its been doing me fairly proud so far, with local trips in the herts area, and some further afield as well, got leicester in a couple of weeks, and a 4 day trip in easter to wales coming up, a few let downs as well (usual for land rover) !. . . there is 1 job im considering doing that i am looking for advice on ! . . . i want to put in some kind of rear diff lock, BUT, the range and diversity are overwhelming to the point of each saying that 'there's is the best' etc etc, now, 1 thing, i cant afford ARB air lockers, so, do i go limited slip ? ive heard/read there not fantastic, how about detroit lockers ? is there any one with experience with these, or for that matter, general diff lock advice, yes i know i have a central diff lock but if 1 wheel at each end is slipping, well, going nowhere, so, advice please !