JoomlaXi Registration Redirector is a plugin to solve above issue. Using this plugin you can redirect user to one of registration system of your choice.
Supported Registration System :
1 : JomSocial
2 : VirtueMart
3 : Community Builder
4 : Core Joomla Registration
5 : Custom URL
Please vote for extension and review it, it motivate us to maintain the product.
Note: I see where ddt4ever might have had his problem. The first time I installed, I somehow downloaded an older version of the plugin. CRASHED my site completely. Luckily, I always backup before installs. Of course, this was not the plugin's fault...just my own silly error. So, I restored, found the correct version for 1.7 and installed with no problems.
Now it works perfectly :)