Sci-FI Christmas

This year i want to get some Sci-fi season box-sets for Christmas could someone give me some ideas, i was thinking i might get Stargate: SG1 the complete series

What other suggestions do you have?

Star Trek: Deep Space Nine and The Next Generation are definite keepers, other than that, I don't know. Ignore what everyone says about Firefly and instead get stuff like Cowboy Bebop and Outlaw Star. Firefly is like a worse version of both those shows.

Farscape was cool