They might as well stop making Big Brother now. There is never going to be a Winner that will top Pete. He's so different, while still being a normal decent likable guy underneath.
Craig, Brian, Kate and Anthony were all average people who had enough charisma to win. (You might be able to put Cameron in that group, but how many 32 year old bible nut virgins who still live with their parents are there in the general population?)
Nadia was a flaming queen, pre-op transexual with a jaw Mike Tyson couldn't break.
Pete has the normality of the first group while being uniquely different from them like Nadia. But not too different to make him unrelatable. For someone to be a better winner than him they'd have to have his model looks, sense of humour, odd manerisms and with a more extreme detriment that makes for entertianing television.
And I highly doubt that's out there.