How to Replicate two Exchange 2010 Servers

Hello all,

     This is my first post here. I fear our organization may have made a grave error. Here is our basic setup:

1. Location 1 - 3 2008 R2 standard servers in a domain. 1 Exchange 2010 sp3 server.
2. Location 2 - 3 2008 R2 standard servers in the same domain connected over CISCO VPN. 1 Exchange 2010 sp3 server

Our objective was to replicate the first site at the second site. We have setup DFS and made a BDC at the second site, no issues. However, I have been doing some reading on Exchange replication, and it looks like we are in trouble. I had read that Exchange 2010 could be fully replicated over two servers (unlike 2007). However, I now have read that this requires the Enterprise edition of Windows server 2008 R2. So, I guess I have three questions to start:

1. Is there ANY way we can replicate site 1 to site 2 with the current setup? Even if it means site 2 is "inactive" unless we need it for a failure at site 1?
2. If not, can we upgrade to the enterprise edition for the servers? Any idea on cost?
3. If we upgrade to Enterprise, is there a decent place to go to read on how to setup the second site?

Thanks very much.