We laboured over the same decision for my son and in the end chose Oxford. The reason was that ox are very successful in helping guys get their first job. We ruled out cabair after visiting it- as it did not seem to be as professional as Ox. You should also look at CTC self sponsorship route as they have strong links with Easyjet - who are a good employer. Also the CTC course is good
Flight training europe is another option and the attraction is small courses and they use bristol groundshool which is excellent.
Having said that our current impression of Ox is that they are a bit overstretched at present. Their link with Gcat may lead to an integrated course with type rating-- worth asking them about that.
My advice would be do not choose on the basis of cost. Look at the record of employment and the pass / fail rates for each training company.
best of luck
RJM