EZRed flex XL spline ratcheting wrenches are my most used. They're usually around $120 and have 8, 10, 12, 13, 14, 15, 16, 17, 18, 19. SUPER useful!
I wish I would have bought the GW flex wrenches rather than the reversibles. I would trade my set of reversibles and stubbies for the flex...