Who is so great a God as our God
On a more triumphant note, for the leave-taking of Pentecost:
Who is so great a God as our God?
Thou art the God who workest wonders.
I like the Byzantine melody much better than the Slavonic, but was unable to find an English version sung with my preferred level of fortissimo for a triumphal hymn. My priest sings it very loudly.
UPDATE: I missed this one on my initial search. Very nice: