Help.. I am confused about mortgages. I am refinancing my home.. I currently have a loan that could go negative amorization?. and I want to change that.. I have been told to go with a 30 year fixed because interest rates are at an all time low... but my mortgage brokers says that it smarter to go with a five year interest only fixed rate.. (I can pay principal as I please, or put the mortgage savings in a retirement account)... I don't know which advice to follow...