How many Exchange mailbox servers do you have?
Given the size of your environment ... if you haven't implemented HA anywhere else, and you're not having issues I can't see the benefit of doing it.
Personally, I'm a fan of simple solutions and BES 5.0 HA is simple ... that said I know a lot of people that use Neverfail and are very happy with it.
If it were me, I'd be more worried about some form of HA for Exchange.
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