Shoutbox

I can't think of a ripper that can't do this;
Just get your ripping tool and set the destination for the ripped music files to the MP3 player when its plugged in.

For example if the drive of your MP3 player was E:\, in the settings for your ripper where it says "location for ripped files" (or words to that effect) you would type E:\. Of course you may need to personalise the location for your own needs of the MP3 player, but the same principle applies.