Along similar lines with Pandorum and Sunshine, there's also Event Horizon. Also, the Riddick series (4 movies)

Ultraviolet and Aeon Flux--not exactly great movies worth more than a single viewing, but not that awful either. Put these at the bottom of the pile.

The Island--decent futuristic dystopia flick, though a bit cheesy at times. Vaguely similar ballpark as Gattaca.

Minority Report and Paycheck.

Solder, and The 13th Warrior - Similar to Outlander.

Timeline

Screamers, and Screamers: The Hunting

Demolition Man, Running Man, and Total Recall (the original, not the remake)

Cypher

Unbreakable--Not sci-fi, but still a really good film.

Bicentennial Man

Equilibrium

For more of a fantasy / supernatural / Vampires slant:
Prince of Persia
Solomon Kane
Daybreakers
Underworld series
Blade series
Stake Land
Reign of Fire

Zombies / Horror:
28 Days Later, & 28 Weeks Later
Pulse, & Pulse 2
Re-animator, Bride of Re-Animator, and Beyond Re-Animator
Zombieland
Land of the Dead

Alien Invasion:
Skyline
Battle for LA
Battleship

There's a director's cut of Donnie Darko, which might help fill in some of the blanks.

It wasn't great. You're not missing much. It was somewhat cringewothy at certain points.

It would've been a much better film with someone else in the lead role.

I just thought of another one similar to Outlander: Pathfinder.