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My 9 month old daughter will soon need to move out of the infant carrier and into a regular car seat. I am planning to move her into the Britax Marathon that we currently use for my 2 1/2 year old son. I was hoping to only purchase one more seat for my son, one that has a harness option for the next couple of years and then converts to a booster seat. I am curious if anyone has any comments or advice between the Britax Frontier and the Graco Nautilus or any other seat that has both the harness and booster options.