Best approach to push data from Server to Mobile Client???

Hi All,

What is the best approach to push new data that got inserted/updated in server side (Server DB: SQL Server 2005/2008, Client DB: SQL CE 3.5)?

-       Microsoft Sync Framework

-       RDA

-       Merge Replication

-       Any other approach???

I need to consider the following points

-       If the client device is in n/w, push the data to client.

-       If client not in n/w, the data should wait in server until it establishes a connection b/w server and client device application.

-       Notify the user of client application that the data/message reached.

Can anyone suggest the best approach possible for implementing this?

Regards,

Praveen K