My preference is for Smiths Sectional Buildings, which are well designed and very sturdy. The Eglu houses are probably more red mite proof but very expensive. Your neighbour has been lucky - a fox will take anything, any time, it's just a matter of when. I wouldn't start chicken-keeping with ex-batts as they may be in very poor shape and have also probably been vaccinated, which could be a problem if you later buy in unvaccinated birds. Get a friendly breed, such as Sussex, Dorking or Wyandotte. Bantams and lighter breeds, such as the Sebright and Araucana, can be very flighty. And read, read, read!