Are you sure you're comparing similar items? The Bachmann may be a power booster at that price and the Digitrax may be a power supply -- there is a big difference between these two terms. You need a power supply to run a power booster. The power supply for most systems is interchangeable because it is nothing more than an AC transformer. Some power boosters are also interchangeable; i.e., a CVP booster will work with any DCC system if you can get the command signal plugs to match.
I would suggest that you phone Litchfield Station, Tony's Trains, Ulrich Hobbies, Empire Northern Models, or some other major DCC dealer and explain to them what you think you need and see what they recommend as your best course of action.
All of these companies are very reputable and will not try to sell you something you don't need.
The cheapest Digitrax booster I see on the Walther's site is the DB150 at $179.99, currently on sale for $159.99.
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jeffrey-wimberly The cheapest Digitrax booster I see on the Walther's site is the DB150 at $179.99, currently on sale for $159.99.
It's $137.50 from Ulrich Models and $134.99 from Empire Northern.
cacolejeffrey-wimberly The cheapest Digitrax booster I see on the Walther's site is the DB150 at $179.99, currently on sale for $159.99. It's $137.50 from Ulrich Models and $134.99 from Empire Northern.
And it will need a PS515 Power supply for about $40.