More info on level, valid sources (books, dragon magazine?,etc.) would be helpful.
That said I have had a decent amount of success in LFR with my drow sorc.
(Sorry for format doing this on my mobile)
Level 8 snapshot
race:drow
class:sorc
spell source: storm
str 8 con 13 dex 19 int 10 wis 10 cha 21
feats: sup imp lancing dagger
versatile exp light blade/staff
dual imp spellcaster
tempest magic (or implement focus)
improved init
trained skills: arcana bluff diplomacy intimdate
key equip: lightning dagger, armor of sudden recovery, amulet of prot
eagle eye goggles, bracers of the perfect shot
powers:
at will: acid orb, blazing starfall
enc: thunder slam, dancing lightning, spark form
daily: dazzling ray, thunder leap (jump up and down into same square)
utility: good timing (hate missing with daily), sudden scales
basic tactics: convert everything to lightning
single target: encounter powers then lightning (acid) orb to death
multiples: blazing starfall or thunder leap.
note that he's slightly built for more single target. you can swap out acid orb for lightning strike if u want more multi target capability. i chose acid orb because of shaman/warlord granting basic attack powers and the range.
if u dont want to deal with lightning conversion go sup imp accurate or staff exp from hotfl. and dump a id orb for lightning strike. keep blazing starfall because:
for the pally you could pick up feat power of the sun and the at will virtuous strike. His targets gain radiant vulnerability which goes well with blazing starfall.