A high level of inner peace when worshiping and praying. Just a regular amount of peace (same as I had before being a Christian) 95% of the time when not in a worship mode. That extra 5% is the best though since I experience God's love when I least expect it.
But if we walk in the light, as He is in the light, we have fellowship with one another, and the blood of Jesus, His Son, purifies us from all sin.