In terms of costs, it strikes me if money is tight then maybe you can only afford to have a few players on the more expensive contracts.
And if that is the case then, much as I am grateful for what Jelleyman and Silk brought to the squad, your full backs aren't the first positions I'd be paying relatively big money for. Football folk always talk about having a strong spine to the team so I think the money would be better spent on an Alan White-type centre half telling the other defenders what to do.