Any question answered...

Buy two UN26 while they have them at that discount. There's not much difference, and two cheap ones will give better service than one mid-range model. Between the other two, the UN55 is worth the extra £2 over the UN54 which it supersedes, thanks to the metal NDS cup.

Thanks for your help, the UN26 was in the wrong size for me in the end, so i went for the UN55.