Question : Exchange 2010 standart or enterprise?

Hi,
I have a network with single W3K domainapproximately 400 users. We have  5 remote baranches but remote sides have no any exchange server (except disaster).There are 1 exchange 2003 server on center. We are thinking upgrade to exchange 2010. But I'm not sure we need enterprise or standart edition. We also will use office communicator. Maybe we will use exchange archiving. But it is not certain. does it effect of the type of exchange(standart or enterprise). Please route me.
Regards,

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Answer : Exchange 2010 standart or enterprise?

Its the Client Access License that dictates the availability if archiving.

The main difference between standard and enterprise server licenses is the databases, standard supports 5 per server, enterprise 100