We have very similar tastes. I've been reading your reviews for a while now.
1. Dark City - sci-fi, mind bending heaven
2. Vanilla Sky - my favorite film for about 10 years. A great mind bending drama/sci-fi lite.
2.5 Eternal Sunshine of Spotless Mind - similar to Vanilla. great mind bending drama.
2.75. Eyes Wide Shut - in my top 10 all time. Severely underrated. Will become a classic with time, IMO. Themes of sin and temptation, but far beyond what it seems to be. Great thriller (although not as much of a mind bender as others...a little...3/10 on Mind Benders scale

)
3. Tell No One - best thriller I've seen since Hitchcock. You'll thank me later
3.5 The Fall - Squid recommended. I love it. You'd like it I think. Great drama with great imagery and another thinking film (beyond the typical plot driven film)
3.75 Magnolia - you just saw it though right?
4. Last Year at Marienbad - mind bending heaven

Read Ebert's review after.
5. The Shining - a great horror that also happens to be an infinite abyss of psychoanalysis
6. Rear Window - Hitchcock's best, IMO
7. The Fountain - go talk to Squid and Jhiggy after...I'm only an orange belt in this one



but its SICK!
8. Requiem for a Dream - same director as The Fountain
9. Babel - a great drama/thriller involving multiple cultures across the world. Not for the dull thinker. Sick soundtrack.
10. Band of Brothers - no explanation needed. Picture in picture option of the real vet's doing live commentary?? need I say more??
11. Big Fish - a fantasy favorite of mine
12. Cinderella Man - a great drama, definitely worth a watch if you havent' seen
13. THe Lives of OThers - my #2 film all time (behind 2001). Check it out. Great drama! Won oscar for best foreign film 2006.
14. THe Prestige - another mind bending thriller (although "light" on the scale of some of the others above). However, Jhiggy and Squid will tell you of alternative theories which make it more complex
15. Repulsion - worth a watch. Great mind-bending thriller/horror.
16 Walkabout - worth a watch. i loved it. some didn't. another not so obvious thinking film. I think you'll like it.