あげく、あげくの

Mean: after much__ing
Situation: Used only for negative results
あげくand あげくの　are the same meanning, but differ grammatically.
あげくis a conjunction, used to join two clause, whereas あげくのalways comes before a noun.
Example:
両親と話し合ったあげく、学校を辞めることにした。
After consulting with my parents, I quit school.　
両親と話し合ったあげくの決定です。
This decision that I reached after talking with my parents.