I'd say no - your home page will naturally rank the best, for most sites. However, it can be a very good thing if some internal article gets so popular that it gains a very high PR. There's no reason to subvert that natural process, if it occurs. I'd say you are trying to over-control the situation, and if you do that you will most likely have problems.
A website is not like a house - people do not only come in through the front door. They come in willy-nilly, through the roof, the sewer system, the windows and the walls. This IS the nature of the web and you succeed more easily if you create a site that flows with that reality.
It is very common on a successful site for well over half the traffic to enter through an internal page. Be happy about that traffic, and make sure that those visitors can still find their way around your site, no matter where they begin their visit.
Here's a thread from the archives about site structure that has a site structure diagram: Theme Pyramids [webmasterworld.com]
And another thread that may help your planning: Information Architecture for the Small Site [webmasterworld.com]