As for me, I think I'm mostly done buying DVD's of favorite classic TV shows, but having said that, there's a few things still on my want list that I would buy if they were made available on DVD:

Tom Ewell Show- one season sitcom from 1960-61.

Cara Williams Show- one season sitcom from 1964-65.

Burke's Law season 2, along with the follow up series Amos Burke, Secret Agent. There's also the Burke's Law reboot series from the 1990's but I wouldn't be interested in having that.

Please Don't Eat The Daisies- 2 season sitcom from the mid 1960's.

That's Life- 1968-69 musical/comedy series with Robert Morse and EJ Peaker. Music rights issues would probably make a home video release of the series nearly impossible.

Arnie- 2 season sitcom from 1970-72.

Forever Fernwood- 1977-78 continuation of the Mary Hartman series without Louise Lasser.

As far as reissues go, I wouldn't mind having a DVD reissue of Barnaby Jones complete series, and this time with all complete, unedited episodes. The set that was released several years ago is pretty much a mess with mostly edited for syndication versions of the episodes.

My Three Sons - color episodes, esp. season 12

Still the Beaver/The New Leave it to Beaver

The ones that come to mind first:

The Beverly Hillbillies (remaining seasons)
Petticoat Junction (remaining seasons)
Hangin’ with Mr. Cooper (remaining seasons)
Empty Nest
Amen

Dear John
Roc
Cosby (1996-2000)
Amen
Hogan Family
Empty Nest
King of Kensington
Trapper John, MD
Night Heat
New York Undercover

Remaining seasons of:

A Different World
Fame
Baretta
The Fall Guy
The Hitchhiker
St. Elsewhere

I guess a complete Beany & Cecil?