Ok. Here's what I need you to do. I want you to give me a budget of how much you are willing to spend on this PC (Complete) alsop take into consideration for Shipping & Handling.
Then tell me what this PC will be responsible for. What Appz you are going to run. You get the idea.
Post those things, and I can really help build the best PC for your office. (You want FutureProof, Reliable, Fast!!!)
I've been building PC's for clients for Office use for the last 2 years. So i've got some experience...