Hey Alex,
I create a lot of short videos using AE and Premiere (this past year, I created hundreds of short videos, both HD [720p] and SD). Mostly motion graphics, plus a little low-end animation on programs like Poser and View Infinite. I also use Fireworks and Photoshop a good bit to create/edit graphics for my vids. I don’t usually shoot anything. I use a lot of stock images, video and music.
In case this is helpful info, I also have a number of plugins that I use in AE, including Element 3D and Trapcode Particular. My current system is a Dell Precision T7400 with 20GB of RAM. I often get choppy playback in Premiere.
Currently, my system has five internal HD’s (4 1TB 7200) and a smaller 7200 rpm HD for the OS drive, and this system is pretty maxed out as far as storage room. No raid, no SSD drives. I also have a number external drives that I back-up to.
Hope that was helpful. Thanks so much for any further info you can give me.
Lon