When you install a new ConfigMgr 2012 site, you should always use the latest supported SQL Service Pack and Cumulative update, and I just noticed that Cumulative update package 6 for SQL Server 2008 R2 Service Pack 1, has been released.
The build number of this cumulative update package is 10.50.2811.0.
You can download the update here: http://support.microsoft.com/kb/2679367/
If you always want to be up-to date on your SQL versions and releases, I would recommend that you follow this blog: http://sqlserverbuilds.blogspot.com/
Enjoy.
