i need to know

Hello Every Body, i have 2.8 GHz Quad-Cor Intel Xeon 8 GB RAM, working as a Editor and motion graphic designer using Final-cut Pro and Adobe CS5 so i wondered What are the additions which can be added to the machine and System to working with HD and Red cam formats. or this configurations are fine, somebody told me you have to add a new Vedio Card and add 8 GB ram to make ur computer 16 GB RAM, i need help from you to know what is the best and cheep configuration to work with HD and RED cam formats. Thanks for ur Help

Matta Roushdy