Buying my first list, help?

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So I will be purchasing my first list this week and was just wondering if I should build my list by county or zipcode? I know both very well.

I have been using Trulias heat map to determine higher priced or average zip codes and It's very accurate for all the zipcodes in my county. I feel like I can build a bigger list if I go by county potentially bringing more deal flow, also tire-kickers, but I can't filter out the neighborhoods I don't want. So the debate is whether to choose that route or go by zipcode which will probably bring less deal flow, potentially more profit, but I have to purchase multiple lists and increase my budget.

Any thoughts guys?
Thanks