Site Architecture Help Needed!

OK so I am having my site redesigned - Spread Betting Companies and I have a question about site architecture. If you can help with this it would be really apprecaited because it's doing my head in.

Up until now I was going to go for the following structure on the new site:

- Top level - splash page (people can either click on sports (spread betting) or financial.

- second level (sports or financial pages) - here would be the main sections and links to the blog pages, guides, etc, etc.

Now the reason for my indecision is that I'm concerned that with my inner pages not being linked to from the homepage as they aren't going to me getting as much google juice. I am also concerned that the hierarchy isn't going to be flat enough.

Of course I will be going after links to the financial and sports pages but these arent going to be "home". My plan was to concentrate on attracting links to all 3 pages - home (splash), financial and sports.

My reasoning initially for going for the splash page is that:

1. Financial and sports spread betting are two separate entities.
2. It makes it easier to link build for me to have 2 separate sites (under the same TLD) for sports and financial.
3. Bounce rate should come right down.

AI hope this is understandable and thanks in asvance for any responses.