Listsource Output Options

[Miles Stanley]

So i went to purchase my list off of listsource and i was a little overwhelmed by the options available at checkout.  You can add on all sorts of extra data for a fee per lead.  My question is, for a direct mail campaign, what data is relevant besides the owner info and property address?  For example, should i waste $$$ adding in the year the house was built, the % equity or the loan details? Or should i just gather that data as leads come in?

Thanks!