ANY of the main production boats will suit you fine. Be it Beneteau, Jeanneau, Catalina or Hunter. If you were in Europe, there would be probably a dozen more you could add to the list.
Yeah there are some lead vs iron differences. Find out the issues with iron, learn to deal with them, enjoy the boat if that is what the boat you like comes with. Reality is, with some of the models, with bulbs below, not sure the iron vs lead is as big a deal as mentioned. Not to say the comments are not correct from a density standpoint etc.
An iron keel is about 1/10th the cost of equal wt in lead, so depending upon the cost of the boat, size etc, you could be looking at $2-3K to upwards of 25-30K for boats going from 30-50' or so extra for lead vs iron. Assuming a new boat, used would factor in some of this cost to.
Frankly, if the Beneteau suits yours and the family's needs, buy the fool thing, enjoy sailing with the kids. The iron vs lead is not worth waiting IMHO! of course, my Jeanneau has an iron keel.....I've not had a lead keel boat, so not sure what ease of maintenance there is, but epoxy
coat the keel, should be good for 10-15 yrs before having to do again.