Funktion said:By the way, I was wondering: is there any series available on DVD (old or recent) with the "cliché" noirish device of a detective/private investigator solving cases?
There seems to be a surprising lack of anime in this sort of genre. The only really clear cut example I can think of is a one-off OAV called "Urban Square" that was featured on ANN a while back. I haven't seen it myself, but they gave it a pretty good write-up there. The only problem is that it's never had a DVD release, so you'd need to find a fansub I'm afraid.
Incidentally, if you liked the old Lupin tv series, you might want to give City Hunter a try - it's enjoyably daft.
On a similar note, the original Space Adventure Cobra tv series might interest you as well, but the only DVD releases with an English sub track are bootlegged and I dunno what the quality is like. The film is quite readily available, but the series is more fun.