My CE ones will suffice for now, and if I feel the itch for more I'll hop on the BA6 train when it gets released I hate to be a fanboy, but I've been impressed enough with Phil's dedication at Cosmic Ears to be converted. Though saving for an X3 (or maybe a DX50 ) when it comes out is a thought.
As far as desktops go, I built mine around 3 years ago with mid/high tier specs. I don't game much more, but I do have quite a bit of music that I've collected over the years. The only other thing I would want to upgrade is my graphics card, the GTX460 has been put through some major OCing lol