What I’m looking for is the following functions;
*Ability to download from multiple groups without needing to manually select them.
*Automatic start of downloading periodically, say every 1-3 hours or so.
*Ability to save into folder identical to the group’s name. (alt.amature.artist instead of just artist, for example)
*Wont hurt if it's advanced enough that you can specify where you want the folders...

*Capable of saving multiple files simultaneously.
*Checks if it already downloaded the file before. NOT if you already have the file, but if it's been downloaded (and probably deleted)
It will be used mostly for pictures, but might also be used for small files.
So far the one closest to this is probably tifny. But, it crashed after downloading for a few hours, doesn’t let you pick a save-location, and also don't allow saving to full group names. It does however run regular checks for new files periodically.
Currently I use SBNews, but it can only be run once, and then has to be restarted before you can use it again. Also don't have any of the listed functions except the saving to folders one.