I have a couple of SEO questions...
 

When you're researching competition for a given keyword - how much of an impact does the competition's PR of their domain name have on their SERPs position?

for example, they rank 1st for "keyword" but it doesn't link to their main page.. it links to www.blah.com/blah.html - how much significance does the PR of www.blah.com itself play?

and...

when you're targeting a keyword, obviously it helps to have the keyword as your domain name - but how much does that value decrease when you add "-" between the keyword words? like: "Men Hair Styles" as "men-hair-styles.com" or "men-hairstyles.com"

Thanks

the main page will only have a high pr if its being linked too, but its pr wont help other pages on the server if its not linked to it.

the second q is , it doesn't matter if its - or not and only plays a minor roll, one of the most important is for the surfer too see a good looking url

The domain name PR is the same as the PR of your root default page and that's all. All the other pages and subfolder pages have to earn their own PR through link popularity (internal or external).

Page jackers can win/steal prominence over your 'keyword domain' which demonstrates that there are many other factors which are taken into consideration.

Separating words with delimiters like '-' does technically parse better, but 'dashed' domains are not as surfer friendly or 'classic'.

You can achieve your SERPS dominance through your pages and directories, which should have delimited keywords '-' or '_'.

:2 cents:

-Dino