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How much should I be contributing to my 401k given my employer's contribution?
Contribute as much as you can.  When do you want to retire and how much income do you think you'll need? A $1M portfolio yielding 5% will yield $50,000/year. Do some research about how to build a portfolio... this site is a good start, but check out books on retirement planning and magazines like Money and Kiplinger. If you don't speak "money" or are intimidated by investing, look for a fee-based financial advisor whom you are comfortable with.