I teach in a FE College, but before that was at several secondary schools. I personally love teaching FE and find that life is much easier than being in a school in many respects, but it is often much harder to find jobs (less jobs come up), lecturers tend to have higher qualifications (most of my colleagues have got at least a MA / MSC or are working towards one and we are not paid as well as secondary school teachers. That said, I wouldn't go back into secondary teaching unless I had to... I just love the job I do now, because there is no 'babysitting', it is just pure teaching with students who want to be there and generally try hard.
However, one important thing to bear in mind is that if you train to teach in a secondary school (Get QTS), then you will also be able to teach in a college. However, if you just take the PGCE in FE (gain QTLS), then you will only be qualified to teach in FE/SFC and you will not be able to teach in a school (or if you did, you would be on the unqualified teachers' payscale).
Given the difficulty in getting FE jobs, you might be best of training to teach pyschology and another subject and then moving to FE once qualified.
It is also important to bear in mind, that FE is different in that there are no national agreements in FE, you are employed by the college and not the LEA, so terms and conditions can vary hugely between the different colleges. You also need to look carefully at where you teach, in some areas it can be quite tough because of the students it attracts - for example, in some areas most academic types stay on at school, so FE can have more than its fair share of lower achievers, which can have its own problems. However, in other areas, liek where I am, everyone leaves school at 16, and so there is a good mix of all abilities and attitudes. You also need to look outr for colleges where students are only there to get their EMA... because FE colleges tend to have very little disciplinary systems (by teh very design of them), but students are not always that mature - so that can be a bit of a challenge. I hope some of this very late night waffle makes some sense