I'm looking for a refresh of my book's headers (it's a French book on physics, in case the content is usefull information). Currently, I'm using the headers style defined in this MWE code:
\documentclass[11pt,letterpaper,twoside]{book}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage[total={6in,10in},left=1.5in,top=0.5in,includehead,includefoot]{geometry}
\usepackage{microtype}
\usepackage[pagestyles,medium]{titlesec}
\newpagestyle{principal}{
\sethead[\thepage][][\slshape\small\MakeUppercase{\chaptername\ \thechapter. \chaptertitle}]{\slshape\small\MakeUppercase{\thesection\ \sectiontitle}}{}{\thepage}
\headrule}
\usepackage{blindtext}
\begin{document}
\frontmatter
\tableofcontents
\mainmatter
\pagestyle{principal}
\chapter{A first chapter title}
\blindtext[5]
\section{A funny section title}
\blindtext[5]
\section{Another hilarious section title}
\blindtext[5]
\chapter{A funky chapter title}
\blindtext[5]
\section{This section title is really boring}
\blindtext[5]
\section{Really funny section title}
\blindtext[5]
\end{document}
Preview:
These headers are nice and I may stick with them, but I'm looking for some refresh and a modern look. What other styles could you suggest for an ultra-professional look of the headers? I'm really lacking imagination and creativity here!
EDIT: I just noticed that I was using small fonts in the header (\small) while the page number is in normal size. Is this considered inconsistent?
Using \slshape\scshape (with the package \usepackage{slantsc} for slanted Small Caps), instead of \slshape\small\MakeUppercase, appears to give a nice output.
But what should be the appropriate or the common size of the page numbers and the titles, in the headers?

