Aw, damn, I already have all of these.
Retail CD versions of Descent I & II: The Definitive Collection, Descent 3 + Mercenary expansion in one of Interplay's dual-jewel packs, and Freespace 1 + Silent Threat in another dual-jewel pack. GOG purchase of Freespace 2 when they were doing the buy-one-get-one-free sale on Interplay games.
Still, for those of you who don't, what are you waiting for?
Also, if you're concerned about not having a joystick, I wouldn't worry about it too much because the mouse works great for pitch and yaw. Movement would be done just like an FPS-E and D (or W and S for most of you) for forward/back, S and F (A and D) for sliding left/right in Descent or rolling left/right in Freespace, W and R for rolling left/right in Descent, and Space and Left Ctrl for sliding up/down in Descent. Not that hard, really, though you'll have to go in and do some rebinding.