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My main question is, investing on quite an expensive card, will it improve overall performance, especially in preview or pre-render?
Only if you use Open GL heavily in After Effects will you see any boon from upgrading your display adapter (which, most pros I know avoid using Open GL in After Effects). And, you should probably never use Open GL to render unless your were a very odd case scenario.
Your money would be much better spent investing in faster processors, more RAM, and fast drives (separate ones...one for the application to run from, one for your source footage, and one for your renders). Of course, having a BUS and infrastructure that can handle full-throttle would be ideal too.
I'll repeat what TimeRemapper said, but more strongly:
Ignore the graphics card until you've maxed out RAM, hard disks, and processors.
See this page for information about memory and improving performance in After Effects. It has links to lots of useful resources, including this page:
Thank you very much to the both of you!