Joomla Weblink customization - Voting and Commenting

I run a Joomla 2.5.x based website. In my website, I use the Weblink feature of Joomla's default component through which registered users can post links in my website from the frontend. I need an independent Joomla plugin that can VOTE-UP or VOTE-DOWN individual Weblinks by the registered users. Just like old [login to view URL] site, or like [login to view URL] Voting Requirements - 1. It must be an independent plugin AND must not hack the Weblink component, so that I face no problem in Joomla Updates. 2. Only registered users can VOTE-UP or VOTE-DOWN links only once. 3. It should show how many TOTAL VOTES, +VE VOTES, -VE VOTES, user names voted etc. 4. The list of links should in the order of +VE VOTES. Comment/Discussion Requirement - 5. Users can also post comment/discussion just like Kunena Discuss. [login to view URL] It MUST use the Kunena forum as comment system just like Kunena Discuss. NOTE1: no hack code is allowed for the component files so that I face no problem while upgrading the Joomla. NOTE2: avoid JQuery, use Mootools. =================== STRICT BUDGET: $20 ===================