My 9 year old son and I are trying to get started on a layout and we can't make up our minds which scale to model. He really loves the sound. We have an O scale track built on a shelf around his room above the doors and windows. We just bought an new MTH diesel engine for this track with proto-sound 2.0 and he thinks it's great. We are going to build a layout in our shop that will be approximately 20' X 10' with an operating pit in the middle. I know nothing about DCC but was wondering can we operate sound locos in HO cheaper than in O guage. Looks like most everything in HO is less expensive. What is the best HO track and switches. Also is anyone familiar with NCE power cab DCC. From what I've read this sounds pretty good but I know very little. Hoping some of you can help us with these decisions.