I could write this list forever. How can you only have 10??
Sergio Leone's Westerns (Dollars trilogy/Once Upon a Time in the West/Duck You Sucker) (The Good the Bad and the Ugly would be the original US cut-hate the extended English version)
Every Kubrick film (saw Dr. Strangelove and 2001 in 35mm-want to see 2001 in Cinerama!)
The Star Wars Trilogy. OOT restored if possible-or 97 SE.
Most assuredly the 70mm restoration of Lawrence of Arabia-the most beautiful film ever made. Plus David Lean's other epics Kwai, Dr. Zhivago, and Ryan's Daughter.
The entire Bond series-saw Dr. No and Thunderball as rereleases!
Lots and lots of film noir-Double Indemnity/Ace in the Hole/Detour/Maltese Falcon/Chinatown. Out of the Past is unbelievable in a theater.
The Godfather, but even more so-Apocalypse Now (original).
The Indy trilogy.
Die Hard would be awesome.
The Wild Bunch-with other Peckinpah (Straw Dogs/Alfredo Garcia/Pat Garrett original cut)
THX-1138
These are off top of my head.
Ones I have seen: Blade Runner Final Cut in a theater blew my mind even after numerous viewings over the years. Vertigo is meant to be seen on the big screen-saw a new print of the 1998 restoration and it was phenominal. Would love to see Notorious. Solaris was insane in 35mm-Tarkovsky's vision should only be seen that way. Saw The Good the Bad and the Ugly but was the English extended cut. And of course, my greatest experience is still ANH in 1997.