Do not go do a rating somewhere just because it is cheaper. I've seen people take the cheap option, then when they get somewhere else and their shortcomings are found out they have realised they have been short changed.
That is why I mentioned JAS, can't go wrong there. Although there are plenty of others that are really good to. I hear Bob Harris has a good rep, as well as flying the duchess to keep cost down I think.
Just my 2 bobs worth.