I would put a small amount into the 401k and focus mainly on feeding a savings account to build an emergency savings account and then a portfolio of CDs and stocks. If your goal is to early retire in 5 years, and you are in your 20s, you need to learn to deal with investing your money now and you need to be able to access your money in about 5 years. 401k plans typically limit the number of funds you can invest in and its not easy to get your money out. I don't have one so I don't know the details on 401ks.
I would put 200 a month in the 401k and the rest into savings, getting ready to transition savings cash to CDs and stock investments when you exceed a 5k emergency savings amount. You might be comfortable with a 2k emergency savings account if you don't have a mortgage and you have good health insurance.