Compare it to ancients?
Well I mean, sure, if you really want it.
Iban Blast 
Max hit - 25
Cost per cast - 260gp
Requirement - 50 Magic
Now, let's compare it to an ancients spell of the same level.
Smoke Rush 
Max hit - 14
Cost per cast - 678gp
Requirement - 50 Magic
Bonus - Poisons for 2 damage.
You can clearly see that iban blast is superior, but let's keep going.
The max hit doesn't catch up until Blood Blitz, a
level 80 spell.
Blood Blitz 
Max hit - 25
Cost per cast -
1,720gpRequirement - 80 Magic
Bonus - Heals the caster for 25% of damage dealt (Max: 7)
Blood burst is superior to ibans blast, but only because it heals. In every other way it falls short of ibans blast. 1,720gp for a level 80 spell that has the max hit of a level 50 spell that costs 260.
So uh, yeah, that's it. If you're willing to do underground pass (which you should be, if you're going for max or at least "good" stats. Fairly sure you need it for some achievement diaries, too.) then go for iban blast.
Any more comparison requests?
also do we have a cc or any form of communication besides the fourms