You're lucky that: a) You have enough runway to do this; b) You have a co-founder.

I'm struggling with the same choice, but I have neither a nor b.

Ugh I'm in the same boat- come up with any ideas on finding a co-founder?

Patience, and actively seeking people out. I have no problem now asking people what their entrepreneurial dreams or ideas are. More often than not, people are willing to share ideas, but stall on commitment of any kind (even part-time).

The hunt continues.

Make sure your founder is also really committed to it. I had one co-founder who kept his daily-job, was married and then, after some months, gave up when we had deadlines and much harder work was required. Talk to him now about vesting plan and make sure he is for the long haul. Good luck!