Graphic Cards Nvidia vs ATI

Whats your max budget sir?

How much do you want to spend?
And what about the other specs?
CPU, RAM, Motherboard, PSU, Monitor?

If you are working as a consultant in this field, I would recommend learning something about the field you work in (IE. go to School) rather than asking generally idiotic questions.
If you know nothing about the basics in the field you consult in you are only hurting your customer, company and future career.