Secondary (but no less important) items that are a must-have:
-MySQL (I'm voting for 5 series here, but that will require my patch for 
the mysql code in SER 2.0)
    
      

why the patch?
  
    

MySQL 5.0.X automatically times out its sockets after a hardcoded period 
of time. Unless you have configured the socket to auto reconnect (see 
http://www.ideasip.com/support/utils/my_con.c.SER2 ), after a little 
while, the socket will just time out and you will have to restart SER in 
order to connect to the database (it will throw errors).