So I know this is more than a year late haha, but I think I can answer your question.
I just successfully updated to Mavericks 10.9.1 from 10.8.5. I used unibeast with the most up to date (.9.1) app store installer,
and deleted all the NVD kexts as usual. Instead of using disk utility and reformatting my drive during the install, I installed .9.1 on top of my .8.5 drive.
After a successful install process, video was really sluggish & laggy as expected.
I then used kextbeast to reinstall the NVD kexts one by one:
NVDAGF100Hal.kext
NVDAGK100Hal.kext
NVDANV50HalTesla.kext
NVDAResman.kext
NVDAResmanTesla.kext
NVDAStartup.kext
(and probably incorrectly) NVSMU.kext
After each reboot, I got no results until I got to nvdstartup.kext.
After that was installed, the fan stopped blowing full-time, and video was fixed. Success!!
Before this, I unsuccessfully tried and ran into the same problem as you; I got a blank, black screen on startup.
It may have been a problem with the NVSMU.kext i installed. When i first tried, i installed all the kexts I listed above at once, even the NVSMU one which i am suspecting caused the problem.
Hopefully this helps you or someone else trying to install Mavericks or other OS X on this hardware!