I think the "personal preference" notion is one of the most detrimental ideas that ever came into the church. Leaves too much room for highly infallible, issue-laden, carnal-minded people to destroy the muscle matter of the body of Christ. Whether we care to see it or not, there IS a blueprint. God, in His instructions and designs, was always very specific (think Noah's Ark, Ark of the Covenant, Solomon's Temple, the Lord's Prayer, fasting, etc). He didn't say do it however you see fit as long as you reach me in the end. He gave instructions, like a good leader does. He's the creative one, and our creativity should be reconciled with His, not the other way around.
I'm opposed wholly to personal preference.