Never I ask myself how can I format all of these... Usually I make a logo in Photoshop or Corel... I can add there the description too... With any font...
In background I often use a slider, or below of logo... or all header is just a picture... or... by eg. see http://www.nathanaelbos.nl..
When I change just the font in header, I and my clients prefer to have the same font for all titles - see by eg. http://www.bodyworker.org/category/yoga/
You see... Suffusion is limited only by your imagination...
It's easy enough to obtain what you wish. First, try to change the fonts used at Typography -> Post and Page Titles. If you don't use a plugin which pull it's own titles in h1/h2 tags this will be enough.
If you still need adjustments, come back, we can change the fonts for all titles and address only blogtitle and description by custom CSS.