I know this question has been out there and asked 100's of times.... So i've done some research and I am 95% sure I want to go with Digitrax super Emptire Builder. It may be a bit of overkill for running 4-5 loco's at one time but I really like having 5 amps over the 3amps that is supplied with the Zepher. Is 3 amps really enough for a layout of this size? And if I expand later, can I add more power by putting in another booster? I would think the boosters would run in isolated sections of tracks and wouldn't be daisy chained to bring my boost up to 8 or 10 amps? And lastly, Has anyone had any problems (not so much features) with digitrax that would sway me to another brand. Do they have a good customer service if I run into problems with equipment/warrenty etc?