I went through this debate with myself a couple of months ago, here is the result. If you are using it primarily for data storage, it doesn't matter which format you use, since the drive you are writing with is the drive you will read with. If you are going to burn the occassional movie, it doesnt matter which format you use, as most dvd players support both formats at this time.
From what I can tell, the next big thing is going to be the laser color. If the blue beam becomes the standard, you can play red-beam created material on a blue machine, no problem. However, blue created disks won't work with red lasers.
Get one that you can afford, either format should work for you. If things change radically, you can either change, or just buy a ton of media for what you have.
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The difference between theory and reality is that in theory there is no difference.
"God made man, but he used the monkey to do it." DEVO
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