An outsiders view.
To an extent Reading already have this, as the stadium is named after the Chairman (just be grateful you don't play at Ellis Park already!). It is different though as Madesjki does have Demigod status in this part of the Thames Valley, so no-one really minds.
I think if it was Reading though then I wouldn't mind if the name was OK, and it was a local company - maybe we would end up with Yell stadium (Yellow pages are based in Reading). In your case you could end up with Cadburys Stadium.
I think the price drops a lot if it is called the xxxxx villa park, as opposed to just xxxxx park, as most people would just drop the xxxxx part.
Given the current sponsorship environment though, the people who are most likely to 'trump' up the cash are the Internet gambling firms. So you could end up with 888.com stadium. Punchy!