Romo is very confident in his ability which was shown in his last contract. There will be no deal ( what I mean is we will not be getting a discount) for Romo just because he signs before the season rather than after it. He knows he can do it, he does not have any doubt so I don't think he will take less now than he would 10 games into the season.
That said, I don't think he is greedy and be asking for a contract like McNAbb, Vick or Manning, but it will be nowhere near a Schaub contract.
I can see a huge staged bonus because of his confidence though. He feels like he will make it very difficult to not keep him IMO.
I think in the end, if he signs now with a staged bonus or mid season with a huge bonus, that the contract will be even more lucrative for him with a staged bonus.