According to the IRS SEP Plan FAQ you are allowed to max out both an SEP IRA as a self employed individual and a Roth or Traditional IRA.
A SEP-IRA is a traditional IRA that holds contributions made by an
employer under a SEP plan. You can both receive employer
contributions to a SEP-IRA and make regular, annual contributions to a
traditional or Roth IRA. Employer contributions made under a SEP plan
do not affect the amount you can contribute to an IRA on your own
Example 2: Nancy, age 45, is the owner and sole employee of JJ Investment Advisors. Nancy contributes the maximum allowable amount to
her SEP-IRA for 2014, or $52,000. Nancy may also make regular, annual
IRA contributions to her SEP-IRA, if her SEP-IRA allows this, or
contribute to her Roth IRA at XYZ Investment Co. Her total traditional
IRA and Roth IRA contributions cannot exceed $5,500 for 2014 and may
be made in addition to her SEP contributions.