domaindiscover.com has a very good track record (when we selected it 6+ years ago it was because it had the highest user ratings- I haven't looked lately but I

domaindiscover.com has a very good track record (when we selected it 6+ years ago it was because it had the highest user ratings- I haven't looked lately but I can say they go way out of their way to let you easily renew domains despite CC issues etc. even well after actual expiration). Dunno about bulk transfer though.