Verbatim DatalifePlus 16x DVD+R
Right now "Newegg":http://secure.newegg.com/NewVersion/FeedBack/CustratingReview.asp?item=N82E16817130961 has the 25-pack for $19.99 with an $8 rebate. The 50-pack strangely is $50, so getting a pair of 25-packs is cheaper.
Verbatim as usual scores very well with their DatalifePlus. It is actually made by Mitsubishi Chemicals. Those guys do a great job. For geeks, the manufacturer code is MCC 004
You could save some money by using the Datalife 8x DVD+R which on the Benq 1620 that I have runs at 12x according to "Tom's Hardware":http://www4.tomshardware.com/storage/20041102/dvd_burners-17.html#blankmedia_compatibility. These are $36 for 50 at "Newegg":http://www2.newegg.com/product/product.asp?item=N82E16817130947