All stereos (BMW) will display some amount of information from the intravee/dension gateway/dice etc but obviously with the nav you see much more just because of screen real-estate!
in fairness there are quite a few options and it also depends on what you currently have.
i've been on here awhile although tend to lurk more than post and am still a little confused as to all the options.
might be a nice addition to the forum to have an overview of possible combinations advantages / disadvantages of each. but that would need someone who nows what they are talking about putting something together - which rules me out!