If the current unit is sized to match the Novakool RFU9000 / RFU9200, go for the 9200 as a replacement. It's dual compressor (separate for fridge and freezer) like many of the Isotherm models and should have similarly good performance. The RFU9000 I've got (with a few small mods) is good, but having separate fridge and freezer temperature control would be much better.