Howling Blast and Dual Wielding
Howling blast is a must. Trying to make a howling blast build, that doesn't have either the higher frost talents, or impurity, is a real gimp. You give up a ton of damage not going to down the frost tree, or at least to impurity in the UH tree.
To be honest, Frost is all about crits. Killing machine procs and cinder procs on weapons. Obliterate absolutely sucks in general as a talent and especially with a 1h you will get far more DPS out of howling blast or icy touch even.
Specing down into blood is really a weapon based damage Eve ISK tree and then using one hander is another gimp. If you're going to go blood, do it. If you want a hybrid frost build, then it's really hard to beat unholy, at the very least down to impurity.