Well, I can give some recommendations but I need to know what sort of characters you want to build (in terms of combat abilities) and what level you expect them to attain.
I don't play using the Psyonic rules so I really have no idea there. Perhaps others can give you an idea.
For the Oracle/Sorcerer/Mystic Theurge, do you plan on being a combat caster, a healer, a party support character? Do you plan on taking more Sorcerer levels or more Oracle levels? If the character plans to take Leadership and potentially take a pacifist type view, he might want to focus on party support and healing with things like Skill Focus (Social Skills), Selective Channeling (to heal), and metamagic feats to compliment his healing/support.
For the Sorcerer, there are any number of ways you can go. The Draconic bloodline lends itself well to fire based attaks, or potentially melee. If you want to go with the first, take Spell Focus and Greater Spell Focus, Spell Penetration, Spell Specialization, and Spell Perfection (as well as the prerequisite metamagic feats). The Elemental Spell feat will let you swap non-fire spells to fire at the cost of increasing casting time. If you plan on using rays, take Point Blank Shot, Precise Shot, and Weapon Focus Ray. If you plan to be more melee oriented and use your spells to support your melee prowess (Transformation, Bulls Strength, Etc...) then consider taking melee feats that compliment the style of fighting you want to use.
^^Also acceptable^^