If you're using IS Boxer, I'd recommend the pseudo-priority system.
Essentially mash a bunch of keys together constantly, with each press of your '1' key.

Mine is...
On Press: Howling Blast
On Release: Howling Blast, Frost Strike, Frost Strike, Necrotic Strike, Death Coil.

See: http://www.dual-boxing.com/threads/3...n-DK-Manifesto