Very cool contest ! 
One important little detail that needs to be addressed...
"WHO IS LAST TO POST ON EACH PAGE OF THIS THREAD."
You should specify a particular number. The reason I say this, is because in each members profile they have the option to change the "default page views number". The default is set to 30 before a new page begins, but some people change this so the board loads faster for them. This would then make a difference on who would be considered the last poster in the page.