If you can get sufficient IAS, use a nef, but LoH is usually too sexy !
Personally i will not up a Buriza unless its 200 ED perfect. With a ED/-15% req jewel, the burrito cannon can get deadly ! A perfect 200% ED burrito with 40ed/-15 req can hit 534 max damage at level 90. Impressive indeed.
Only a WF will beat this in terms of damage.
P.S. If you are dying for 11 frame MS with Buriza do this. Cat's Eye + LoH + Treachery armor + Mav helm with 15% IAS jewel + Nos coil. 220% IAS this should make the Buriza hit 11 frame MS while still leaving 1 socket free in it.