32GB is definitely the minimum for AE and where you want to be for Premiere. 64GB would offer longer ram preview playback before AE has to write to the disk cache. If you get 64GB I would suggest 8x8GB 2666 sticks at this point. The 16GB sticks at 2666 just released but they are for Dual Channel systems and may not work for Quad channel. Starting with 4TB black drives in raid 0 would be good to start with. Just make sure you have a solid backup process.