Youtube to MP3 Converter Site

I need a site similar to either [login to view URL] or [login to view URL] or http://vidtomp3.com. The conversion must be fast..that is the most important requirement. Please read thoroughly as there is a slight twist in the requirement. 1. User goes to the site and enters the youtube url. The site must be able to detect invalid url and inform the user that the url is invalid. 2. As the site is downloading/extracting the mp3 from the videos, an ajax progress bar must be visible to the user with the necessary information like "downloading file", "processing file", "extracting mp3"..etc. The progress bar should indicated the % of the process that has been done and the time to completion. 3. Once the MP3 is processed from the video url, the mp3 file would have to then be uploaded to my file hosting site [login to view URL] using a specified account on my file hosting site. Once the Mp3 is uploaded to [login to view URL] the download url will be presented to the user for him to download the mp3 file 4. Please note that this will be a separate site from [login to view URL] and will be installed in its own domain which is to be advised later. 5. I would like to have an ongoing maintenance for this site. I don't have much budget for the initial site but willing to sign a monthly maintenance fee of between $50-$75 just to keep the conversion fast and keep the site error free and adapt the whatever changes youtube might have in the future. 6. If you have done this before using your own code, please message me the demo url. I am aware of all the similar scripts that are available at the moment from 3rd party providers so please do not try to deceive [login to view URL] your implementation supports other video sites as well, the better. 7. You will need to install/maintain the site in my server. 8. I need this done within a couple of days if possible.