I think that Feanor was the most powerful elf. It says in the Silmarillion thast he was the greatest among the eldar in mind, body and spirit. I think given the chance he could have beaten Ecthelion in single combat. In single combat he could have beaten Gothmog as Ecthelion did but Feanor also had to contend with other balrogs not just Gothmog.
Also Fingolfin should be amongst the most powerful as he was the only one to compete in combat with Morgoth personally.
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His sword was long his lance was keen
His shining helm afar was seen
The countless stars of heavens field
Were mirrored in his silver shield
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