I always wished there was an arcane version of rangers in dnd. Someone who can wear medium armor, solid at fighting, and gets a few arcane spells, and maybe some interesting feats relating to whatever the class is called.
Is that too much to ask for?
They come in variations, ranging from Bard to prestige classes like Spellsword or Eldritch Knight (if you can make some high end mithril armor with additional enchantments to relieve arcane-casting penalties). Bards can sport medium mithril armor easily enough, or any medium armor with an enchantment or modification to make it "light".
http://www.iourn.com/dnd/classes/prestigeclasses/spellsword.htm
and scans of the actual book:
http://www.scribd.com/doc/54984169/68/Spellsword
You could also just... make your own class? Take the ranger class and replace it with power/level equivalent arcane or bard spells and feats. Just... careful that you don't make something OP as fuck. "He imbues attacks per round with spells by consuming one spell slot, and has full BAB + extra attacks from feats and haste, so he casts 7 fireballs per level by only using one fireball spell slot", also, he's an archer.