I've seen your post from previous NetPro topics. I am very curious to know how many branches and offices are you going to operate. Is your Head Office going to have Wireless too?
If your office will have Wireless in plan, I would recommend that you consider a Wireless LAN Controller. You deploy your AP's to your branches/offices and configure them for Hybrid Remote End AP (H-REAP). It's a very cost effective solution.
Introduction to Wirless LAN Controllers (Standalone):