Considering the power boost the base races got in PF, it's not hard to make Genasi balanced against them with no level adjustment or anything. Here's my attempt at such...
Fire Genasi
+2 Dex, +2 Int, -2 Cha
Medium sized Humanoid
30 ft base land speed
Fire Resistance 3
Produce Flame 1/day as a Druid of their character level
+1 racial bonus on saving throws against fire spells and effects, increasing by +1 every 5 levels
Darkvision 60 ft.
Automatic Languages: Planar Trade, home region
Bonus Languages: Any (except secret)
Added a bonus to Dex, I think fitting for Fire. Reduced the fire resistance and dropped Burn. Produce Flame doesn't strike me as too powerful, IMHO. Comments?
Thanks.
Personally I'd give them Fire Resistance 5 at least, and drop the racial save bonus to fire spells.