Well as it turns out I'm wrong according to representatives from Fidelity and Vanguard.
You can't split the employer/employee contributions to a SEP-IRA and an indivdual 401(k), you have to choose one vehicle or the other. So for 2015 tax year I will choose the Individual 401(k) because of the superior savings potential over the SEP-IRA. Unfortunately, because I already contributed some to my SEP-IRA for 2014 I'm locked out of utilizing an Individual 401(k) for 2014.
Finally, it is turning out that Fidelity offers index funds at a much lower expense ratio than does Vanguard, within the confines of the Individual 401(k) plans.
With Vanguard, even if you have $10,000 or more in the Total Stock Market Index Fund within the individual 401(K) you are only going to be able to be in the more expensive investor class mutual fund, the lower cost admiral class mutual fund is closed to you. That means you're paying an expense ratio of 0.17%, versus the 0.05% that Fidelity would charge for the same mutual fund ($10,000 minimum). With Fidelity you can start off with their investor class Total Stock Market index fund with an expense ratio of 0.10% which is automatically converted to the lower cost advantage class once the $10,000 minimum threshold is reached.
This theme is repeated with total international stock market fund, and total bond market index fund.