It took me a while to stumble around on the internet trying to find some means to decide on the scale of the train. I wanted something large enough that it would be visible when standing on the floor. The cost per foot of track is almost identical for the various scales and I presume this to be a result of the cost of the actual rail and intricacy when assembling it. The cars and engines also cost about the same and this seems to be a result of the smaller trains needing less material but more detail while the larger trains are easier to assemble but require a great deal more material.
In any case, I think I am down to either G-scale or O-scale. So, I ordered a G-scale caboose and an O-scale caboose. This will help me decide on the scale. I am thinking that G-scale will be the best size, but I still need visual confirmation.