Not knowing exactly what you have as a set, or what you’re trying to replace with regards to wedges makes it difficult to know what lofts you do need. For example, if you set ends with a Pitching wedge and it is 48 degrees, you would need lofts that will fill the distance gaps you may need on the scoring shots. So, a 52 degree “Gap Wedge” and then a 56 degree Sand Wedge would be the logical progression for you to add. So that should give you some idea of what to look for.
As far as a model, the Maltby MAX wedges would be my suggestion. Great all round wedge that fits a broad range of players. So, possibly a 52 degree in the 0.90 sole width model and the 56 degree in the 1.05. The slightly wider sole on the 56 degree is a little more turf forgiving for shots around the green as well as sand shots.
Take this as it is intended, as a general guideline. You can review the MAX wedges and the details about them at the link below.