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Which graphics card you pick doesn't matter much for After Effects. Ask folks more familiar with 3ds Max what they'd recommend, since that's going to matter more.
You've got a decent amount of RAM, which is crucial.
It also seems that you're thinking smart in terms of having plenty of fast disks. Here's a thread (on the Premiere Pro forum, but still useful for you) about optimum disk setups for performance: http://forums.adobe.com/thread/662972
Agree with all from Todd, and some things I'd consider:
Dual CPUs will pack more rendering punch, especially in your 3D work.
Even though 16GB of RAM is generous, I'd consider more. Remember the rule: 2GB for each CPU core, plus some more for OS and other applications. If you're running 8 threads/cores for rendering, 24GB would be optimum.
While the hard drives will provide awesome performance in that config, it's a lot of money to spend on less than a terabyte of storage. RAID 0 is also pretty volatile, so be sure to run a reliable and regular backup system.
For my money, I'd probably use one good-sized SSD for a system drive, then 3 or 4 conventional (or hybrid SSD) drives for media storage, with a decent RAID controller. You'll get 3 times the storage for half the price, and still have quite zippy I/O speeds.