I need a list of positive and negative words with the weights assigned to words according to how strong and week they are. I have got :
1.) WordNet
There is an interface to give different opinions for SentiWordNet, if you think they are wrong: http://sentiwordnet.isti.cnr.it/search.php?q=repose
I downloaded latest Wordnet 3.1, and checked the file format documentation, and don't see any mention of the sentiment numbers you mention. It is also not shown in the online search.
So, for both those reasons I'd suggest going with SentiWordNet!
(I see your question is a year old, so perhaps you can tell us what you did go with, and why?)