I just finished submitting www.willietc.blogspot.com to like 20 directories in hopes to get higher PR. But what happens when I buy a domain? Do I keep the same page rank?
As long as you do a 302 redirect to your new domain you should be able to keep the PR and link juice coming to your blogspot blog.
You probably won't be able to get much link juice passed from blogspot to your new domain...since you won't be able to redirect from them to your new domain. You'd be better off spending the few dollars a month to host the site on your own domain. However, after you've got your own domain then you should probably keep the blogspot blog and put a link or two to the new domain.
I really dont know weather you use redirect 302,301 on blogspot or not, if yes then your new domainwill get the pr if your bog get
first of all include your blog in webmaster toots. when you buy a domain then redirect your blog to site and assign new url's in google webmaster tools.