The money site uses an internal linking structure whereby each post links to others in the same category. So post A links to post B, B to C, C to D, D to E, and E back to A again.
A PR4 page links to 5 posts on your site.
A PR4 page links to 10 posts on your site
A PR4 page links to 15 posts on your site
A PR4 page links to 20 posts on your site
Which of the above is best if you want to rank as many posts as highly as possible? At what stage would you think you're diluting the link juice too much and would move onto another PR4 page to start the process again? Remember that these are generally low competition keywords we are trying to rank.