I build all of my new pay sites on MechBunny. I also will mod the script to new features and things I want outside of the basic delivery. Sometimes it costs more, and sometimes not. You can bend a tube script into a hybrid type of pay site if you wanted.
As for design, I use various designers depending on need.
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Should You Email Your Members?
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Enough Said. 
"Would you rather live like a king for a year or like a prince forever?"
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