I have a 5'X9' and use ez track 18", 22", 26", and 28". The benefit of the 26" and 28" means I can run most anything. And I do. Don't let the 5 at a time become an issue as the benefit over max 22" will increase your enjoyment of many more types of locos and rolling stock that will run much better on the larger radius track. Just my two cents.
Bachmann DCC locos with the basic EZ Command 1 amp system. Yes, there is a slight reduction in speed but I only run freight cars so a little speed loss is no issue for me. Bob