Actually both of them will work with your DVD Writer especially if you got it recently. The -R are cheaper than the +R. Both of them would work, but might give you trouble if your DVD player for example is supporting only -R or +R. I tried both and no problems so far. You got a huge amount of data to copy, ... it would be more convenient if you buy an External Hard Drive [USB or Firewire] and store your data their. DVDs are ok, but if that DVD get a scratch then it is done. Get one of those WD or Maxtor big ones and store your data there. WD is available at Carrefour in 3 sizes and almost five or six models. 250GB, 500GB and 1Tera and it is available in USB models, and Firewire models too. The Firewire is a little more expensive, but it is a lot faster than the USB. Prices are 400Q.R, 620 - 670 and 1000+.
Please refer to these two links for more information about the DVDs Format:
http://www.dvddemystified.com/dvdfaq.html
http://www.webopedia.com/DidYouKnow/Hardware_Software/2003/DVDFormatsExp...

Best Regard

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