I did see the encoders on there as well, probably just worth getting it all from them, as you say it should all be compatible then!

I've sent them over an email to check it is all going to work how I need, will have to wait and see if they get back to me or not though.

I hadn't thought about the main power supply actually, good point! The current set up has a fairly substantial transformer unit that appears to output various voltages, I know there is a supply at around 140V in the unit supplying the current drives but can't remember if its DC, will have to check!