The short and truthful answer to "How much will this cost?" is: it depends.
As you consider your defense, remember that no lawyer worth their salt ever quotes a fee without knowing specific facts about the case. Watch out for certain types of lawyers that promise big results on the cheap:
Just because someone has a law degree doesn't mean they are qualified to defend your case. In the long run, cheap attorneys can end up costing you more because you have to hire another lawyer to clean up the first one's mess, or you lose and have to pay the considerable cost for an appeal, or you end up going to jail (or prison) and having a criminal record.