You should look into ways to drop ram usage if your running Vista and using 1gig of ram with your browser and media player up, you should be able to drop it to right around half that. I know of someone who posted a nice little thread on some tips on how to do so, but I am having trouble finding it atm. Some light searching should give you some good tips on how to do so. Oh and as you probably know, if you upgrade to 4GB's of ram and you're not running 64-bit Vista/64-bit Xp, it won't recognize the full 4 gigs.

Also, the rocketfish (a division of Lian Li if you didn't know) is a nice case but that ultra looks very clean.