I too have had good luck with Meritline's house brand 2X DVD-R disks. Very reliable -- I mostly no longer wait through the verification process in Toast as I've always had clean burns. Price fluctuates, but currently around US$1.25 per disk if you buy in bulk. They also have a great price on 3-up printable labels: 150 for about $10.
DVD2One creates files that fall just under the max capacity of the disks, and so data doesn't get burned out on the scary edges of the disk where the media be potentially less stable. When I create disks in DVD Studio Pro (Mac) I often filled up every last sector, and then would be sure to verify the burn.
And yes, as suggested above, you can safely interrupt/stop Toast's verification process without harm to the disk.