Migrate IIS 7.0 Websites to IIS 7.5 Retain Configurations

We are performing a server upgrade from Server 2008 SP2 32bit to Server 2008 R2 SP1 64bit and in the process we need to migrate all websites and retain all the configurations in IIS for all websites.

We are reviewing two different options for migrating all websites and need to verify which IIS migration path would work best. 

Option 1) Use WebDeploy to export websites to *.zip files from IIS 7 and import into IIS 7.5. Note: the msdeploy command indicates that the EXACT same version of .Net Framework needs to be installed on the destination server and our destination server will not allow us to install .net 3.0 because it is Server 2008 R2 SP1 with .net 3.5.  (Is there a possible work around for this scenario)?

Option 2) Migrate websites using the Shared Configuration Export?

We need to ensure all SSL certificates, bindings, etc... are all retained.

http://www.interactivewebs.com/blog/index.php/server-tips/migrate-from-iis-7-0-to-iis-7-5-in-a-new-windows-2008-r2-server/

Any input would be greatly appreciated.

Thanks.