Cheap HW Firewall and multiple IPs

Are there any cheapo hardware firewalls that can accomplish this ? I am upgrading my Colo from 1 to multiple servers and have bougt a cheap Dell Powerconnect 3024 managed switch on Ebay to hook'em up to.
I was wanting to put a cheapo firewall in front of the switch. These cheapo firewalls only has one IP adress, so I am kind of missing the idea of how things get routed to my servers in the end game, since my servers are going to have public IPs. Is this doable or do I need a router with firewall capabilities for the task ?

 

 

 

 

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