The New HRE / Dymag hybrid wheels appear to be the best route as they have CNC machined centers which have connecting spokes, this ensures a proper seal and sufficient strength. The old magnesium core dymag centers had spokes that did not connect to one another which weren't as strong, and would leak occasionally, unlike the HRE design. Either way the Dyman CF barrels are incredibly strong and can withstand punishment that probably even some steel wheels couldn't handle (much less aluminum). The weak link is the center hubs, not the CF barrels.
Here is the link to their site, you can clearly see the difference in the center hubs...
http://www.hrewheels.com/wheels/seri...=/CARBON/CF43/