Of course, the other thing that might be cost-effective for you is to do what I've just done for pretty much the same reason - I got a 250GB external USB 2.0 7200rpm hard drive from Amazon for £99, and I archive my projects on that. Sure, 250GB isn't a whole lot in .avi terms - but it's a whole lot more convenient than ~70 DVDs...

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Premiere Pro, Encore, Photoshop, Ulead VS6, WXP Pro, Core 2 Duo, 2GB, 2 x 250GB SATA3 drives, 2 x 250GB USB 2 external drive, DVD writer, GeForce 7300 GS 256MB

The biggest fool can ask questions that the wisest man cannot answer...