What are the new Dropbox Business plans?

We have just received notice that you, as a company, are moving from a business account to a four tiered ‘pro’ ‘standard’ ‘advanced’ and ‘enterprise’ system for Dropbox, with our account being shifted to an ‘advanced’ system (usability as of now, price as of next year),

By the looks of it we’d most likely want a ‘standard’ account (mostly because of the price!), however this does get rid of the ‘tiered admin’ abilities, would this then mean we’d only be able to have one admin for the account? In which case, what would the other members not be able to do? I understand the accounts do not get upgraded in terms of price till next year, can you confirm this?

Also I’ve seen you are moving from unlimited version history to 120 days for all your higher accounts, as a business we would need unlimited version control and so we have ‘opted in’ for now, would this then revert to 120 days in January 2018 or would we keep unlimited version control from now on?