I'd like to purchase a mac pro for my business. 90% of my tasks are the standard email, internet, business software etc. I do run Windows XP through a VM primarily for Quickbooks Pro. I do use Photoshop and Iillustrator about 10% of the time. My problem, I love Mac's OS, and I want to run one 30" and one to two 20" widescreen displays. This pretty much limits me to running a Mac Pro. I refuse to run a Windows Only PC. Given this information, do you think a used Mac Pro would work well? If so, which models/years should I be looking for? For the displays, I'll probably need two video cards, and I'd like an airport card. Are these easy to add if the machine I buy doesnt come with them?