Drow make excellent sneaky scouts, but as a Sorcerer will need to find a way to get Stealth and Perception. This generally costs two feats (Multiclass Ranger, Warlock or both), but can also be done with a Hybrid.
Here is a Hybrid Sorcerer|Rogue that should be both fun and effective. The idea is to take Rogue powers at levels 1 & 2 and then focus on the generally stronger Sorcerer powers at level 3 and above. In order to maintain the Sorcerer focus throughout the progression, take Sorcerer powers first, then retrain the level 1/2 powers to Rogue at levels 3, 5 and 6.
====== Created Using Wizards of the Coast D&D Character Builder ======
Backlash, level 6
Drow, Sorcerer|Rogue
Sorcerous Power: Sorcerous Power Dexterity
Hybrid Talent: Soul of the Sorcerer
Soul of the Sorcerer: Wild Soul
Darkfire: Darkfire Charisma
Background: Occupation - Foe Killer (+2 to Perception)
FINAL ABILITY SCORES
Str 8, Con 12, Dex 19, Int 10, Wis 12, Cha 19.
STARTING ABILITY SCORES
Str 8, Con 12, Dex 16, Int 10, Wis 12, Cha 16.
AC: 21 Fort: 15 Reflex: 19 Will: 19
HP: 49 Surges: 7 Surge Value: 12
TRAINED SKILLS
Perception +11, Stealth +14, Streetwise +12, Intimidate +14, Acrobatics +12
UNTRAINED SKILLS
Arcana +3, Bluff +7, Diplomacy +7, Dungeoneering +4, Endurance +4, Heal +4, History +3, Insight +4, Nature +4, Religion +3, Thievery +7, Athletics +2
FEATS
Level 1: Armor Proficiency (Leather)
Level 2: Hybrid Talent
Level 4: Instinctive Darkness
Level 6: Weapon Proficiency (Parrying dagger)
POWERS
Hybrid Rogue at-will 1: Sly Flourish
Hybrid Sorcerer at-will 1: Chaos Bolt
Hybrid encounter 1: Mists of Disarray (retrained to King's Castle at Level 3)
Hybrid daily 1: Lightning Breath (retrained to Blinding Barrage at Level 5)
Hybrid utility 2: Spatial Trip (retrained to Double Take at Level 6)
Hybrid encounter 3: Flame Spiral
Hybrid daily 5: Thunder Leap
Hybrid utility 6: Energetic Flight
ITEMS
Subtle Dagger +1, Parrying dagger, Genasi Soul Leather Armor +1, Cloak of Resistance +1