I use the Save as... funtion mainly because it doesnt strip the exif data from the file so it is shown in the image details (nothing worse than someone asking for critique if the settings arent visible - plus it is good for people to see how a shot was taken for learning purposes).  Personally i think it should be mandatory to include exif, but that is just me and my nosey self wanting to know how a shot was taken and with what lens etc etc...

the jaggies might also come about because of the site's compression when viewing it... i always put my shots in as full size and not resized when uploading for that reason and because detail is also lost.  Also, oversharpening can increase the visibility of these "jaggies"... that might be one factor to consider.

I find the 9 setting (why it is out of 12 i know not) decent enough (unless you have a wide expanse of a similar colour, in which case artifacts are very noticeable).  Even with the exif attached, at 800px on the longest size, my shots rarely get above the 200kb mark... (which is good practice anyway - imagine the space RR could save if everyone who posted uncompressed jpegs at 500kb a pop posted each image under 200kb!)

"In every colour, there's the light.
In every stone sleeps a crystal.
Remember the Shaman, when he used to say:
Man is the dream of the Dolphin"

Rich Meadows Photography