What Mal said about x1000. When Apple says developer preview, they are dead serious. This is not intended for people to run this on their primary machine as their primary OS - it is intended for developers as a testing environment to test their products.
People ask this question before and the answer is not going to change - unless you have a darn good reason and a separate computer, dont bother with pre-release apple software. I have and trust me, you are best waiting until its finally out.
This is defiantly a if you have to ask, you arent going to like the answer"