Lupin the Third: Mine Fujiko to Iu Onna, in my opinion is one of the best remake ever. The style, the characters are very well done in this versio. I haven'tseen the 70s version but I think this version is more near to the manga than the original.
The plot was really interesting, everything in this anime was perfect in my opinion. There should be more anime with this style, because they are very enjoyable.