Since you are familiar with Pathfinder/4e a simpler d20 system can work well.
Green Ronin has 3 variations worth checking out.
Blue Rose,
True 20, and
Mutants and Masterminds.
Blue Rose was their first one, 3e D&D d20 with simplified mechanics, no attacks of opportunity for example, and a damage save instead of hp. Classes and magic are different and less complex and specific than D&D classes with more flexibility built into their design with a lot of class power coming from feats.
Blue Rose is by default romantic fantasy with its own default romance fantasy setting.
True 20 is taking the system from Blue Rose and making it applicable to non romance fantasy gaming. Three classes: warrior, expert, and adept (magic user), a feat each level, and stats are just the bonus, not some number you calculate the bonuses from. Magic is different from pathfinder, most are one feat to know them and use a fatigue system instead of vancian slots.
Fantasy Paths shows you how to recreate 3e/Pathfinder core classes in True 20 if you want to. There is also the
True 20 Bestiary converts the srd monsters to True20 stats.
Mutants and Masterminds is turning the system to creating comic book style RPGs and so it gives a system for creating tons of individualized powers while using the basic True20/Blue Rose/d20 mechanics. The 2e version has a sourcebook
Warrior and Warlocks which describes how to use it to get the experience of the Conan style swords and sorcery comic experience including sword fighting and magic.