I actually have CD versions of each of them (D1 & D2 from a collection and just D3 no expansion) and have been debating picking up the GOG versions for ease of downloading, installing and the MAC soundtrack (which I've read good things about).

The problem with sales and laziness, they make rebuying stuff you already own so tempting

If I were in your shoes, I'd probably buy D3 again just for the expansion pack. I mean, three bucks, come on.

Definitely get D1 and D2 again! Cause you never know what might happen to old CD's. and for $3 there's just no reason NOT to! :)

I still have the original CD-ROM for D3 laying around somewhere. Is the expansion alone worth buying the D3 pack at $3?

I already picked up the D1+D2 pack and Freespace from this sale :)

Thanks for the input guys. Unfortuantly I dithered and then got distracted by the kids and completely failed to get back in time to pick them up in the sale.

Hopefully it won't be horrendiously long before the next one.