Curtis Anderson up until a few months ago was a very expensive record.Someone found a box of them in the States and has been selling them on ebay,last one I saw still fetched £400ish.Though the last few probably went for less.Sure someone on here can tell us.
As for the 7" being worth more than 12"'s.even if the 12's are rarer than the 7's,the 7's still go for more!
The 7" is the holy grail
Pete