I think Porta, Smith and Bradbury would be relatively cheap.
Porta, 32 chance to finish his career in Aus wouldn't demand to much coin, I wouldn't imagine his on big dollars in Ecuador so the wage may not be to dissimilar.
Smith, chance for regular 1st team football, could possibly get a loan deal.
Bradbury, park football or a professional contract?
As to Cambiaso and Holland yes I agree they would demand marquee wages.

