Be critical about your prospective partners, and build in a trial period, if at all feasible meet in person.
A good business partner is my opinion about as hard find as a good marriage partner.
And you only really know how good your partner and you work together when you hit a serious obstacle.
Take your time, better to work a little harder and keep your options open for a while than to say 'yes' to someone too early.
This is probably even harder than finding a live startup, you seem to have that one licked though :)
One down, 50 to go or so!
btw, it's 'dilemma'.
Be critical about your prospective partners, and build in a trial period, if at all feasible meet in person.