To be quite honest, they are all pretty much exactly the same. All the parts used are made in the same factory, just gets a brand name printed on the front. If you are going to go wireless (I only say this as you have asked for a '4 port') then I strongly suggest that you don't!! Sure, get a wireless router, but for the playout machine (running 24/7 I take it?) then I suggest you use a wired connection, the main reason for this is because the connection down a wire is 100Mb/s and through the air it is 56Mb/s. You also have a secure, and uninterruptible connection.
I hope that helps!!