Personally, to cut the chase on these sort of hand utilities, I've resigned myself to rely on cnet.com for quick comparison.
I currently alternate between :
- http://download.cnet.com/YTD-Video-Downloader/3000-2071_4-10647340.html ----> To make use of the conversion capability
- https://addons.mozilla.org/en-US/firefox/addon/downthemall/ -----> For on-the-fly quick downloads from my browser
I intentionally left part of your question unanswered :D