Hi Oren,

there are several datasets that include DTI data. There is for instance the Beijing_Enhanced Sample that includes DTI as well as IQ information. Most DTI data can however be found in the NKI-RS and the NKI-RS-Enhanced sample. If you browse the release tables you'll see which sites include DTI data. From there on it should just be clicking to get to the data

http://fcon_1000.projects.nitrc.org/indi...

Let us know if you have any further trouble locating the data.
Cheers,
Maarten