Exchange 2010 Assigning User Tier in Database

I am designing the mailbox storage for a Exchange 2010 setup.
The requirements for my organisation is to have 3 tiers of user - Tier 1 being low usage workers (100), Tier 2 with average users (300) and Tier 3 are heavy users (200) with high I/O plus blackberry service.

The Exchange Storage Calculator recommended 3 Databases and 200 users per database.
How should I allocate users to the 3 database?

I think I would get better performance if I spread all tiers of users across the 3 database.
However, it would be easier to manage users if I place each tier within its own database but that would mean that the database with Tier 1 users will be underutilized?

Any comments are welcomed!
Thanks.
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frukeusAsked:
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BusbarConnect With a Mentor Solutions ArchitectCommented:
the exchange calculator distribute the users across DBs, this is the way Microsoft recommends it, but there is always pros and cons. there is no solid statement for that.
Most of my customers prefers dedicated DBs for users, they benefit from that also in SLA and backup since high traffic users usually require higher SLA.

I usually use the calculator to get the IOs then distribute my users based on my customers requirements.
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