Actually I want a regulated one ,Very very few 5 amp circuits need the level of regulation provided by an integrated regulator.
Why don't you follow the path of many who have well regulated 1 amp ± supply and a fixed 24 - 30 volt 5amp or even 10 amp supply? These could be from the same transformer and bridge or a different one.
I have seen many an amateur bench furnished with this arrangement. It works very well.