I have a potential client asking for a proposal - not entirely sure what to give him.

I don't want to go over the top and give him a very in-depth proposal when we already talked about what the benefits of SEO etc. are.

But, I also don't want to look unprofessional with 3 lines on a page.

How do you guys handle this - structure it into a powerpoint presentation and show it to them??

Thanks,

James