Its Bitcomet for me..prefer it over Azureus, ABC, BitTornado etc...Its quite fast..ie in terms of the program itself and uses less resources
and for ur problem bad_till_bones...
http://text.dslreports.com/faq/7454...offers the following explanation
" If the download is not green (status isn't verified) than the file has not been verified and will not be moved to the completed files folder until verified. Alternatively, it may very well be that the download is still missing a few bytes - 20kb, 30kb at the end - and the download really isn't finished. In this situation patience will usually pay off, or you may want to try the above solution."