recommend a multi-function appliance?

I was wondering if many of the functions I need are nicely and cheaply performed by one device? What I can think of are:
1. load balancing
2. firewall
3. DDOS and related protection
4. switch
5. what other stuff haven't I thought of I might need for a largish system in a data center?

Since all these features are built around IP it would seem like they could be done by one appliance, at least for a 10Mbs connection.

 

 

 

 

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