No problem Steve
I think we all get caught up in the upgrade cycle when it really doesn't add anything.
In any business model you simply need whatever works and within budget.
There really is very little that DVD-SP can't do for SD-DVD so even if it gets left behind on the next round of OS X (Mountain Lion) updates you could easily run a legacy system HDD (Mac OS X Lion for example) for less than a hundred bucks and simply boot into that when needed.
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