I made the jump from my single client (job) to multi client cashflows in 2005.

The way I think of this is...

"At this point, we're all really freelancers. The only difference is if you have single client (job) or many client income."

My preference == Many clients income.

As soon as your startup produces profit enough to cover your current income... quit your job...

Then focus on putting in more paying clients every day.