Thursdays Trading Game Plan

Looking towards Thursdays trading action I'm inclined to sit back and let the market tell me what to do. Two scenarios will most likely happen tomorrow. The first being a break above 841.75 on a closing basis will bring in more buying and a reasonable rally. Some upside targets are 855, 868 an 882. The alternative scenario will be a break of the important 819 area on a closing basis, which will in my option lead to more selling and a sharp decline. Which one?...we'll know tomorrow.