Well...I would recommend Canopus but I wouldn't buy it
I would not have enough usage out of it to make it worthwhile, but you may.
I've never used a converter device from a 3d party, it's alway too convenient to just run it through a VCR and capture card, considering subject matter and quality I desired.
Don't know if you are familiar with this, but you may want to visit http://www.videoguys.com/
and let them help you do some research.