Well, I have a Paladin | Sorcerer / Rogue / Daggermaster of doom.
OF DOOM.
Ok, it's no DPR king, but it's a real gish. From level 1.
Stabs good, blams good, tanks good.
It is a drow, 'cos cloud of darkness is my favourite power of all time, yeah.
1: 20 cha 16 dex 11 con, HT for armour.
20 cha = decent with teh longsword.
20/16 = fun with blazing starfall.
Took virtuous strike 'cos it's an MBA, and blazing starfall will usually be the at-will of choice.
I went with valorous smite for teh funky multi-sanction (see lv 3).
Daily is almost irrelevant, but I went with Howling Tempest. Stylish.
Aim to pick up either some boring magic plate or boring magic dagger.
Yes, dagger. 'cos it does everything - so your other magic gear can help in defense.
2: Focused Expertise - Dagger, 'cos it's cheesy.
Bless Weapon. It's like dude. Retrain to Dragonflame Mantle at level 6.
3:
Flame Spiral. Valorous smite first, they'll come running. Flame spiral attacks up to 3 of 'em (no friendly fire), and automatically burns adjacent foes with another damage roll. Damage roll bonuses FTW.
4: Nimble Blade. Yes, really. More hitroll. Remember you get 2 rounds of free CA due to Cloud of Darkness. Fun with other powers noted above.
5:
Hallowed Circle. Just divine challenge and blam foes from here for funnies.
6: Weapon Focus - Dagger. (Retrain lv 2 power to Dragonflame Mantle)
Wrath of the Gods. If you anticipate trouble, precast on whole party.
7:
Price of Cowardice. If they don't fear your weak DC, zap 'em hard (also, interrupt so it doesn't break your standard actions' rhythm). Particularly funny if you move in, drop a cloud of darkness, then use a valorous smite.
8: Sneak of Shadows. Just 'cos sneak attacking with spells is fun.
9:
Prime the Fire. 'cos by this point, any power that potentially inflicts 2x arcane damage rolls with an area burst is the go. Oh, btw, should be on the lookout for a subtle dagger right about now. Free CA = more damage on every damage roll. Frost is an alternative if you're going with the really cheap lasting frost stuff.
10: (will be retrained next level) Toughness?
Fog Form. Sometimes an invitation to get stacked on requires damage reduction. I'd consider re-swapping the level 2 utility back to Bless Weapon at this point.
11: Surprise, it's a daggermaster. Shield Specialization and Merciless Killer.
Ok, sure, you've got -2 hit/dam with critical opportunity, but whoops ... it's only a minor action.
12+ You get the picture. The character does it all. Even opens locks ... hey, summoned armour isn't more expensive than just enhancement, so you can bamf it away for that. Stealth is nice, too ... if a background was taken that gives access.
Edit:
Daggermaster can be overpowered, I guess ... so there's an alternative.
Drop all the rogue stuff, and be a champion of corellon.
Could also have a little story about a drow mage getting converted ..
Maybe even pick up some of Caelynnvala's Boons in a group of elves, eladrin, and drow.
Either way, 'mage with billions of AC' is the concept.