Is there anyone in the San Diego area that is/or can recommend a custodian for self-direct plans?

@Sean Harrison

First, custodian is only required for self-directed IRA, and is not required for truly self-directed Solo 401k plan. It can be set up as a trust allowing you to have checkbook control over your retirement funds.

Second, location is of little importance here, this is a niche that not too many are familiar with, find a provider who offers great service and knowledgeable in this field, rather than looking for someone in your backyard. 

@Sean Harrison

The key is service and expertise as you will likely have questions regarding how to invest in real estate or alternative investments.  

Here is a post that answers frequently asked questions regarding self-directed 401k plans: https://www.biggerpockets.com/blogs/9552/82969-the-self-directed-401k-faqs

It is often helpful to look at the expenses associated with choosing and adopting a plan, periodic restatement, etc.  Also, be aware that all banks do not handle the account type used by 401(k)s with the same facility.  I can help you get started if you would like to send me a private message.

Thanks @George Blower and @Dmitriy Fomichenko . George, I will read through the FAQs.

I am happy to share my contact that helped me out. I pay ZERO fees yearly and have 100% control over my investments. DM me if you want the name of the person that set mine up for me. 

@Sean Harrison

If you're self-employed, you might be eligible for a Solo 401k, which offers many benefits over a self-directed IRA:

• Compared to an IRA, Solo 401k contribution limits are roughly ten times higher.
• There is no custodial requirement for the 401k.
• You don't need the additional expense and administration of an LLC to have checkbook control.
• There is a built in-Roth component whereas IRAs are either traditional or Roth, not both.
• A spouse can also participate in the same Solo 401k plan.
• The Solo 401k has additional tax benefits over an IRA when investing into real estate using leverage.
• The penalties for prohibited transactions are less severe, though it's best not to utilize this benefit :)

I'd recommend you reach out to a few providers who regularly post here on BP to get a better understanding of your options.

@Justin Windham . thanks for the insite. I have been really noticing the benifits of the 401k compaired to the IRA. I thought i would qualify, but it seems i need to find a self employment job.

Lol

 "The penalties for prohibited transactions are less severe, though it's best not to utilize this benefit :)"

For all following this post. There have been some great answers here, but I came across this webinar (now recording) in the BP marketplace, and found it incredibly insightful

https://www.biggerpockets.com/forums/109/topics/685989-so-glad-i-incorporated?highlight_post=4055700&page=1#p4055700