So, after reading all of the comments and some of the links and not being a lawyer, nor YC founder and residing outside of the US and just been there once on B1...
The plan:
* get to the US first on B1, quite easy to get and relatively applicable for YC
* while there, set up a US company and open a branch in your own country and make it to employ you officially
* continue to investigate your options and if young file for J1 (internship) or if older file for O1 (achievements) with references from other founders/VCs
* don't mess with H1B
* worst case scenario if you didn't apply for other kinds of VISA - leave the US and come back periodically on B1 if need be and continue to be employed in your home country by a branch of your company in the US. after a year or so apply for L1 (inter-company transfer) which is almost automatic to get and allows the spouse to work too.
The plan:
* get to the US first on B1, quite easy to get and relatively applicable for YC
* while there, set up a US company and open a branch in your own country and make it to employ you officially
* continue to investigate your options and if young file for J1 (internship) or if older file for O1 (achievements) with references from other founders/VCs
* don't mess with H1B
* worst case scenario if you didn't apply for other kinds of VISA - leave the US and come back periodically on B1 if need be and continue to be employed in your home country by a branch of your company in the US. after a year or so apply for L1 (inter-company transfer) which is almost automatic to get and allows the spouse to work too.