Help with tax filing status - NJ?

i just got married and need to know what to change. I have 2 kids from 1st marriage. I have been claiming head of household until now. my husband was laid off from his "real job" most of this year, however he also owns his own business. Should i file married separately, married jointly, head of household. help,help,help. i earn under 23000 a year and live in nj. my husband earned about 20000 with his real job and unemployment. i ususally get a return of 7500.