General Discussion

I would like them to be strictly OVA or Anime Films(preferably anime films).

I know Madhouse does a lot of incredible animation, from the new movie Redline to their collaboration with Marvel in Hulk VS., and Marvel Anime like Iron Man, but it'd like to hear some other options.

Gainax and their Evangelion movies is something else that I know about(can't wait for the third movie - You can (Not) Redo =D).

Not big into Studio Ghibli. As good as their animation might be, the anime itself just doesn't seem to grab me.

BONES, Madhouse, Gainax, etc. Like the most well-known animation studios.

I'd like some new suggestions. Thanks guys.

Are you only looking for contemporary titles, or OVAs with amazing animation relevant to their time.

@Turambar: Well, I would prefer for them to be modern anime titles, but in truth if you can bring it back for me I wouldn't mind that. I enjoy anime from all time-eras.

I'll just drop small few for starters.
 
Something Old:
08th MS Team
0083 Stardust Memories

Something New: 
Break Blade
Gundam Unicorn

Something Not Mecha: 
Ghost In The Shell: Solid State Society (Viewing of the original Ghost In The Shell movie required)
Knocking on Heaven's Door

Akira is always brought up. I haven't seen it in forever and didn't like it that much, but I think there's some good animation in it. Spriggan has some nice animation in it during combat. The Haruhi movie has some nice work as well. None of it is action oriented but it's very visually impressive at times. Bleach movie 4 has some pretty awesome animation on a regular basis as well.

I wish I could help more, but I watch very few anime films so I'm not very familiar with them.