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I was reading that just as you replied. Thanks though! I kind of expected to be able to search for specific parts in a matrix similar to how they have their packaging/thermal.
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The Stratix V are still new (yeah, I know, Altera is advertising their 10 series), so I'd recommend looking for available part numbers first, and then decoding them. Its unlikely you will be able to create a valid part number based on the data sheet and then actually find it available (unless you're really lucky). I find the simplest way to find the "most popular" part is to look at the parts used on the evaluation kits.
Cheers,
Dave