Consider going with the PSR-S900.

As Squeak says, it's a tad heavier (1 lb), but I didn't notice it much, and I'm pretty picky about weight and portability.

It has the pen drive you're seeking, a familiar operating system,vocal input, as well as an audio to USB (a feature I really find handy)...plus, it has SA voices!

I had a 3000 and I'm glad I did the upgrade to the S900.

You should check to see if it fits in your present keyboard case because, as Squeak pointed out, it is a bit larger.

Ian