If all four are fit then it's a very nice problem to have and one I'd find difficult to sort out as a manager. I would go along with the theory that Dunk and Goldson should keep possession of the shirt until they lose it. Goldson has been a revelation and also very patient, biding his time professionally earlier in the season.
Each has a weakness however which you may want to take in to account when assessing who our opposition are. I'm not at all convinced by Uwe in the air so against anyone with a couple of big lads he might miss out. Similarly Greer is only going to get slower so may not be ideal against a pacy side. Dunk seems to thrive on the big games. Often his errors are against the lesser sides (e.g. the penalty that never was against MK, losing Heskey for Bolton's first on Saturday). Goldson is just a bit unproven at this level, but otherwise looks the complete CB. So it could well be Goldson + 1 for the rest of the season.
Each has a weakness however which you may want to take in to account when assessing who our opposition are. I'm not at all convinced by Uwe in the air so against anyone with a couple of big lads he might miss out. Similarly Greer is only going to get slower so may not be ideal against a pacy side. Dunk seems to thrive on the big games. Often his errors are against the lesser sides (e.g. the penalty that never was against MK, losing Heskey for Bolton's first on Saturday). Goldson is just a bit unproven at this level, but otherwise looks the complete CB. So it could well be Goldson + 1 for the rest of the season.