Connectivity..

Aye, it generally depends what you are using the monitor for

Display port (DP)- The main reason to use this is if you want to run eyefinity as having a Display Port connection is very useful as you don't need to buy an active adapter (also you can use a DP1.2 hub to connect to multiple DP1.2 monitors from a single Display port graphics output. Also if you have a professional grade monitor and graphics card you can use a DP connection to make use of higher colour depths.

HDMI - the main reason to use this over DVI is for the carrying sound signals (DVI doesn't carry sound). So if you are connecting to a AV Amp or your main audio device runs off your monitor/TV then HDMI is preferable. Also, if you want to run 3D content to a 3DTV then a HDMI 1.4 connection is pretty much the only way available at the moment.

DVI - I would recommend this be your default connection type unless you need the special features mentioned above. With DVI you usually don't get an hassle with overscan/underscan on monitors and the image quality is just as good as the above connections. Also, dual-link DVI has more bandwidth than a HDMI so with this connection you can run very high resolution monitors (2560x1600@60Hz) and drive a 1920x1200 monitor at 120Hz. Also, using 120Hz monitors is how current 3D PC gaming system work - making use of a dual-link DVI connection.
 
I have dual 6950 cards, and I am thinking about getting a Dell U2410 monitor.
Is it worth getting a dual DVI cable for this setup?
 
I would suggest using DVI. Plenty of bandwidth for 1920x1200 @ 60Hz, no issues with scaling and the U2410 comes with a DVI cable in the box.
 
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