basically I'm looking for a few features and I'm hoping I can get some opinions or information on which of these features I can and can't accomplish with SIGP, and if it can't do everything I would like please recommend the best combination of extensions you think I should use.

I would like to:
1. have something that handles thumbnails in articles (automatically resizing, display full size in slimbox)
2. have something that can automate making stand alone galleries outside of any articles (ie like the old phpGallery but I prefer the thumbnail->slimbox variety)
3. would like to allow people to post comments on pictures, preferably without having to log in yet still be able to input thier name rather than just showing as "guest"
4. Would like to be able to display other things besides images in slimbox style pop-ups. for example iframes or embedded video (does not have to handle the video itself.

Any input is greatly appreciated. Thanks in advance.