What is the correct device to use for content/application routing/switching?

We currently have 2 data centres and traffic from anywhere is sent from our customers to a Windows cluster IP and TCP port number. Its old and unreliable and unwieldy.
What i am looking for is a device that sits one network hop up from our 2 data centres that can support our internet facing IP address and make routing decisions based on a combination of source/destination address and source/destination port as to which data centre and ultimately which server the traffic is forwarded to. This will then allow me to direct all traffic to one DC whilst hardware in the other is upgraded.
In the old days I would have looked at things like ACE or even CSS but those are gone or going and there does not seem to be a clear replacement path with Cisco unless someone knows different.
Thanks in anticipation of replies

Hi Matthew, the load balancing that was with the CIsco ACE has been reintegrated into the IOS of most ISR routers now a days. This would be the type of appliance you would be looking into to direct and control the traffic from the 2 data centers. so I can give you a recommendation on the best appliance to look into please send me an email at [email protected]
Regards,
Ferdz

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[Side Are Expanded|www.computech.com/images/temp/2.png]
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[Streaming Weather Collapsed|www.computech.com/images/temp/3.png]
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[Logbook Only Expanded|www.computech.com/images/temp/4.png]
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Such beautiful and professional mockups. Which quite contradicts this:
As a newbie to JavaFX and rusty with Java in general, what is the best way to build my skeleton so that it can accomplish all 4 of my statesYou say that as if you want to believe there is some "novice" way of going about implementing such a professional looking piece of software. But you know just as well as I do that when your knowledge and skill level is low, you're only going to be able to achieve a dinky looking approximation of what you want to achieve and you're likely going to exceed whatever budget you have.
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