What TV shows do you collect on DVD?

I've got season's 1 and 2 of Lost, 1 of X-Files, and 1 of How I Met Your Mother.  I want to start collecting Buffy, Farscape, and Stargate SG-1. 

 What other shows are worth watching over and over, and collecting on DVD?

Very, very few. Season 7 of South Park, Mary Hartman, Mary Hartman (anyone, anyone?), The Office, and anything by Rooster Teeth. That's about it.Pepperpop10

Yes I remember 'Mary Hartman, Mary Hartman' although I didn't enjoy it enough to buy it on DVD but I was very suprised to see it at the store a couple of weeks ago. I don't get too many collections of TV series. The only ones I have are:

Buffy (all volumes)

Danger Mouse (all Volumes)

Speed Racer (all volumes released so far)

Sealab 2021 (all so far)

Venture Brothers (season 1 & 2)

Johnny Quest (first volume)

Monty Python (complete set)

...discounting anime TV series of course.  

Just The Office right now.  :P

That 70's Show, Family Guy, and Futurama

Ive got all 9 seasons of The X Files, season 3 of 24 and one season of Friends, the friends season i got for free from a friend, so why say no to that :)mimic-Denmark

Is it worth getting all of the x-files?

well,i was going to make this huge post about all of my tv shows on dvd and decided against it.for the extremely curious......

http://www.dvdaficionado.com/dvds.html?cat=1&sub=Television&id=mattcowart

Too many to list

every episode of redvsblue

some south park

lots of the simpsons

My collection includes the Simpsons, Family Guy, Nip/Tuck, Lost, The Sopranos, and a partridge in a pear tree.

I'd recommend all those as well as The Shield, Rescue Me, South Park, and Chappele Show.