LTR Principia is a delightful variable-only typeface in Upright and Italic styles, with a width axis ranging from wide to condensed, including seven carefully picked widths.
The sharp, wasp-waisted contrast and striking ball terminals make it stand out. With an extended character set, stylistic alternates and many ligatures, case-sensitive shapes, some pretty arrows, and a properly-aligned fish.
The fonts mentioned in this article are available to rent by the month for a fraction of their retail price on Fontstand.