Frost Breath is the best, effect wise, I'm sure. Wu Jen has Breath of the Frog or something like that. In any case, isn't Reserves of Strength used for this sort of cheese? It breaks the cap, after all...
As for the 1st level spell, it's Jet of Steam at 1d4/CL (Max. 5d4), 30' Line. It's decent for it's level, I think, since it can be warped, and has more range than Burning Hands. But that's just damage, so there are better effects...