To have a 3rd child.........I need some help!? Experienced parents!?

Okay, so I am married & we have 2 daughters. We are comfortable right now financially, I started a new job, good pay & my husband is 1-2 years away from a promotion to probably add 15-20,000 to his salary. Together we make $70,000.00 a year right now & have GREAT insurance and he has a company car, which is completely free (including gas). We do have about $25,000.00 in debt from our wedding & me being off work for about a year. We know within 5 years everything will be in great shape financially, but we want our children to be close in age (our girls are 18 months apart) we don't know if it's worth the "rough" patch now to have another child or if we should go ahead with his vasectomy. I know by the time they would all be 6,8,10 that everything would be fine, but it's right now I am worried about. Did anyone else go through something similar & it was worth it? Should we go ahead with another baby? It's not like any of us is starving...it would basiclly mean less shopping trips!