The Dave Jones Design synchronizers are rock-solid and a great way to keep the cost of an installation reasonable. A couple notes on these worth repeating:
These units are standard-def only right now.
If you need frame accuracy, you need to use the Pioneer DVD-V8000 with blackburst. The DVD-V5000s are cheaper, but only accurate to within 2 frames. If you plan to have any cuts in your final edited piece, you will want the frame accuracy. If you are only using slow dissolves, perhaps you can get away without it.
DVD players have moving parts, and these will eventually fail. You may want to budget for and purchase a couple spares upfront, so there is no significant downtime in the installation when one of the DVD players fails. This will also increase the longevity of the system as a whole, because you would be able to avoid any problems from mixing different Pioneer models in the same installation.
Some questions similar to this have been asked recently that mention a few other solutions, including solid-state playback systems from Technovision, as well as a range of more expensive networked computer-based playback systems.
Are you shooting this with 12 cameras simultaneously? Your rig for the car must be impressive!
Walter Soyka, Principal
Keen Live, Inc.
Presentation, Motion Graphics & Widescreen Design
RenderBreak: A Blog on Innovation in Production