Subject to change, of course.

Level 9: rog 7/soc 2     Spells Per Day: 6/5
Cantrips:   Arcane Mark, Detect Magic, Detect Poison, Open/Close, Ray of Frost
1st:   Feather Fall, Spider Climb

Level 10: rog 7/soc 3     Spells Per Day: 6/6
1st: add Grease

Level 11: rog 7/soc 4     Spells Per Day: 6/7/4
Cantrips: add Mage Hand
2nd: add Darkvision

Level 12: rog 7/soc 5     Spells Per Day: 6/7/5   stat: +1 DEX   feat: Weapon Finesse - Dagger
1st: add Chill Touch
2nd: add Cat's Grace

Level 13: rog 7/soc 6     Spells Per Day: 6/7/6/3
Cantrips: add Prestidigitation
3rd: add Haste

Level 14: rog 7/soc 6/arcane trickster 1     6/7/7/4
1st: add Truestrike
2nd: add Gliterdust
3rd: add Dispel Magic

Level 15: rog 7/soc 6/arcane trickster 2     6/7/7/5/3   feat:
Cantrips: add Mending
4th: add Improved Invisibility

Level 16: rog 7/soc 6/arcane trickster 3     6/7/7/6/4   stat: +1 CHR
2nd: add Bull's Strength
3rd: add Fly
4th: add Polymorph Self

Level 17: rog 7/soc 6/arcane trickster 4     6/7/7/6/5/3
Cantrips: add something
5th: add Teleport

Level 18: rog 7/soc 6/arcane trickster 5     6/7/7/6/6/4   feat:
3rd: add Vamparic Touch
4th: add Enervation
5th: add Hold Monster

Level 19: rog 7/soc 6/arcane trickster 6     6/7/7/6/6/5/3
6th: add True Seeing (not castable unless CHR>=16)

Level 20: rog 7/soc 6/arcane trickster 7     6/7/7/7/6/6/4   stat: +1 CHR
4th: add Minor Globe of Invulnerability
5th: add Wall of Force
6th: add Greater Dispelling