Suggestion request for Workstation Specification

Hello everyone

I design rf and high speed multilayer PCBs up to 12 layer....I want to simulate pcb with awr microwave office(axiem maybe) and CST PCB studio. I need high performance computer called workstation but I dont know how to define right processor(intel xeon or ?) right graphical card(quadro or tesla or something else) or should I think rack station or desktop one. Could anybody know about the workstations please help me the workstation specifications

thanks in advance