I've purchased a PR 6 domain what will be best use of it ?

[IndiaFPS]

I've purchased a PR 6 domain what will be best use of it ? Should make a new site or redirect it to my low pr sites? Or I wasted my $100 ?

[GPainter]

Buying a domain for the purpose of redirecting isn't the best use unless its in the same niche the link profile will look different. You could work on creating a separate site with good content that engages people and then can get a good link via that or risk 301 the site however its not a guarantee of a boost in SEO and could just dilute some of the links you've already earnt.  It depends on how white/ black hat you want to play it really. White hat wise you've wasted your money, black/grey hate there are some uses but they don't always work.

[DarinPirkey]

There are a lot of questions to be asked to give you the best answer possible.

What does the link profile look like?  Are any of the old pages indexed?  Is this an expired domain?  Did it have a penalty before?  What are the metrics behind the domain (ie MozTrust, Citation Flow, etc)

Just because it was a PR6 doesn't mean it still has PR6 value.  I've seen a lot of PR sites that get that way because of a 301 redirect.  Metrics behind the domain are way more important to me than the actual PR#.  I've sen PR1 sites provide better link juice than PR3 sites because of the relevancy of the site and the link profile of site.

That being said. I would throw the domain into Majestic SEO, SEMRush and do a site: search.

Here are some useful resources to help you going forward:

http://www.seroundtable.com/google-old-penalties-expired-domain-17883.html

https://www.youtube.com/watch?v=C-EdhaMDXho

[JaneCopland]

Two great answers here already.

Basically, you may have a strong resource to work with but Google is also keen on not allowing brand new site owners from benefitting too much from the authority of newly-purchased websites. Google is a domain registrar for the sole purpose of accessing comprehensive whois information and understanding when websites / domains change hands. If a domain's registration information, hosting and content changes drastically, there is nothing stopping Google from removing the authority that domain once had.

Again, this is not to say that the domain won't be useful, but you will probably need to build a useful site on that domain that reflects the quality of the links that have helped it achieve a PR6 in the past. Simply redirecting it to a new location will probably not be of much use - I seem to remember that Google started stamping out that practice's usefulness five or six years ago.

$100 also seems quite cheap for a PR6 domain, but maybe you lucked out!