Phd without funding is not a good idea.  however, if your intention is to get here in usa and apply for jobs then you can come here and do so.  however, without OPT i doubt it will be easier for you to get a job provided H1B situation remains the same like this year and last year.  i would suggest you to apply to few more universities and try to get funding for your phd.  also, ask professor of this school who granted you admission on their phd program that if they can provide you funding after a semester.  Phd is a research degree and why would someone spend money on doing research for university with hard earned money. furthermore, if you come here for phd, try to complete phd rather than looking for a job.  you already quit phd and now you are again thinking of doing so.   

timer, comprehensive exams are not bad, research and papers are.  good luck to both of you.