Hello Rachel,
I have been going through the same review process. EDGE was far too NHS based for us. I then looked at both Documas and IRMA from University office. Bother were excellent systems and would have worked well but the costs associated were too high for our team of 2 to justify. They might be worth you looking into if you have a good pot of money. I have ended up asking a colleague in IT to try and design a system for us to use. Sorry i know this is probably not the helpful answer you were hoping for but perhaps there are some more options for you to explore.
Please let me know if you find a super solution.
Best regards,
Joanne