Ideally I'd like something that outputs simple binary/grey logic over three outputs, however I have discovered US Digital do absolute encoders with the option of outputting a 0-5V analogue output, and I will have analogue inputs available, so that is one option.
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I don't need highly accurate positioning, as there is another sensor that takes care of making sure things are aligned, it's just I'd like to add some form of feedback so I know what position things are at, rather than having to continually keep track of position. More so for power on, to eliminate the need to enter the current position, but the additional monitoring will be good to ensure things are running the correct way.