Home page keywords: What do you choose?

My business has several services that are only loosely associated with each other. Because of this, i can practically build unique keyword lists for each of these different services.

It's easy for me to think of implementing these groups, each group with it's own page on my site. However, what would I use as keywords for my home page? The best producing from each of the groups? Only pick one group?

I don't want my site to seem too broad and not rank for any of them... anyone with some advice on this would be greatly appreciated.

Thanks,

Chocko

No one with any advice on this?

Maybe my question wasn't worded right...

If i have 4 services and none of them are really associated with each other, i can obviously build 4 different pages for them with their own set of keywords... but what keywords would i use on the home page?