DVD-RAM support with DVD-R? That would be the Panasonic LF-D311. 1X DVD-R only and no CD burning. (I have this drive and it works well with both DVD-RAM and DVD-R.)
Fastest? That would be the DVD+RW/+R drives, at 2.4X for both DVD+R and DVD+RW, but no DVD-RW or DVD-RAM.
Fastest DVD-R? That would be the Pioneer DVR-104 at 2X DVD-R. 1X DVD-RW only and no DVD-RAM.
Thus, no current drive suits all of your needs. You will have to choose. Or you could wait until late fall/winter to get the newly announced Panasonic, which does DVD-RAM/DVD-RW/DVD-R/CD-RW/CD-R. (Hitachi already makes one, but it has only ever been sighted in Japan, and as a bundled drive with NEC computers.)