Well, this is what I've surmised from your posts over months: tell me what I've got wrong.
You do not wish your middle class son to have to cope with non-middle class - or middle class of the wrong variety - children, as such children do not talk correctly, mock anyone who doesn't watch X Factor, don't value achievement or effort etc.
You consider that education and teaching in state schools, particularly state schools with a broad range of ability, is generally lacking and discipline poor.
As such, you think that selective private schools, HE or grammars are the only way forward for bright middle class children.
As such, I would have thought, a system which chose who got to go to grammar school by postcode would probably suit you quite well!