Perfect Speaker Combination for custom 4X12 cabs

Hello..

I am a brand new member. I was referred to you guys from a fellow tone junky friend of mine. 

I am having 2 custom, road ready 4 x12 cabs made by a boutique cabinet builder for the new 

Classic Heavy Metal band i am working in. I have tons of cabs, and heads, however I have chosen

the newer version of 5150 family, the 6534+ peavey heads... which are extremely rich and meaty sounding high gain

amps.I am also accustomed to vintage 30 celestion Speakers. My buddy, and my gut are telling me to pull the trigger

on the 8 Veteran 30's I have in my cart... is there a better choice to get super tight bottom, smooth meaty mid range,

with no shrill highs?

thanks

Stephen Harris