>>10134635Bachmann pretty much dominates the ready-to-run HO set market in the US, you're not gonna find much else available. One thing I should say though is that while it's great for starting the hobby with and perfect for a 7 year old, E-Z Track is kinda piss-poor for proper layout building. If you want to do a 2-train layout you might need to branch away from E-Z track and into something more traditional like Atlas.
How much space are we talking here by the way? You might not be able to get a full 2-track layout in a 4'x8' but you can cheat a bit by doing a folded figure 8 like pic related.