I'm looking to get out of analog into basic DCC.  I've watched the Bachmann EZ Command video on YouTube, and it answered a few questions, but left me with a few more questions.  A little background before I ask.  I'm really interested in just powering 2 or 3 Bachmann locomotives overall.  I don't have any sound systems or anything of that nature, I just would like to run 2 or possibly 3 locomotives at the same time.  Nothing fancy, just something simple.  The locomotives would be the Saddle Tank Porter, a 2nd Gen 10 Wheeler, Thomas, and possibly other Thomas related locomotives in the future.  The fanciest I would get on track plan in the future, would be a reverse loop module.  Currently I can run a Porter and Ten Wheeler on the same track with the factory supplied power pack and everything runs just fine, however I would like to control them independently.  I would convert the DCC ready Porter to DCC and Thomas as well before the transition.

Will the Bachmann EZ Command be enough to power a Porter / Thomas or Percy / Thomas at the same time or Will I have to get the 5 amp booster?
Is the Bachmann 1 Amp Decoder w/ Wire Harness sufficient?
If not, which decoder do you recommend?
Does anyone have experience with the Bachmann Reverse Loop module in large scale?  If so what would I need to make it work? (besides switches and an isolator of some kind).