Bobby, I'll help a brutha out. I dont use contracts! Ok, I know thats not what you wanted to hear but all of my previous costomers pre-pay and they love it! Any new customer, I present myself and my services and if they have any questions i hand the my "bread and butter". Its a list of customer who told me that they may be used as referrals. I tell them to please call and ask as many questions as they would like. If they havent written a check by the time I leave then I'll usually get a call that night telling me its in the mail.
This may sound like i'm tooting my own horn but i feel its the easiest, as long as remember to manage my money correctly.
Others that may not want to prepay I dont offer a 10% discount to. Before I tell them about the 10% I tell them the price for service, that way they dont think youre screwing them.
So after all that, no i dont use different contracts. lol