Building a 212 cab

Okay

I have a line 6  40 watt spidervalve combo with 2 12" celestron v30s in it. I am building a 212 cab for it.

I play mostly classic rock and blues but venture into other styles as well, though all my originals are based in a punchy blues style.

Should i get a veteran 30 and a et65 for the cab, or get 2 et65s and put one in the cab and swap out one of the celestrons in my combo, or build the cap with 2 et65s, or just put 2 veteran 30s in the cab to match what is in the combo? I do want a more punch to my bass.

Also, if I put one of each in the combo and cab, should i mount them so that the cab and the combo have the different speakers at each end?