Bachmann yes, DCC no
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Our local hobby store has Bachmann DCC with out sound starting around $59 and with for $100
As a starter engine, are they a good engine?
The current run of Bachmann engines, especially the diesels, and pretty good models for the money. I've had a GP40, SD40-2, and F7, as well as working on a 45 tonner. All have been surprisingly good. They're not in the same category as a Kato or BLI, perhaps, but they're also nowhere near the price. I would not hesitate to recommend them as a first engine. If you have the inclination now or in the future, some of them (the F7 comes to mind) could definitely benefit from extra weight, but it's not a requirement and I would not take that as a criticism or a reason to avoid them.
I also own and like a number of the Spectrum steam engines. I have a 2-8-0 and three 4-6-0s, and have heard nothing but good things about the 4-4-0 (modern version, NOT the old timer) and 4-8-2, as well as the non-spectrum 2-6-0 which came out recently. Some of them, especially the smaller models, do suffer from weight and pickup issues which are easily rectified by an experienced modeler, but they might not be my recommendation for a first engine, or for a 10 year old. However, given the price you mentioned, I don't think you're looking at steam anyway!
On the other hand, I've had and heard of mixed results from the low end Bachmann DCC (non-sound) decoders. The motor control is not the best, and almost every model I've seen with factory DCC has benefited from replacing the decoder with a better quality model from a company like Digitrax or TCS. You will generally get better low speed performance, quieter running, and probably better features (lights, BEMF) with an aftermarket decoder If the decoders are on a socket, replacement is as simple as unplugging one and plugging in the other. If they're hard-wired in, you'll need a little experience soldering small wires, but it's not hard at all.
Go ahead and buy the DCC models, since you have the Zephyr, but consider replacing the decoders in the future. It will be a good way to get your feet wet and learn a little bit about installing decoders, so that you're more comfortable buying a non-equipped model in the future. Also, I should note that the Bachmann sound equipped models typically come with a Tsunami (or at least a stripped down version of one), and the quality comments do not apply there. They're an excellent value, and I would not suggest replacing those decoders without a good reason, as there's no need to do so.
Now, if I may, I'd like to make a suggestion. You have an excellent opportunity to teach your son how to work on things, and to build things. I have often found that the skills I've learned as a modeler have come in handy in my daily life. Sometimes it's in repairing something around the house, other times it's in my knowledge of materials and solvents, or painting, soldering, or a number of other aspects which I've been able to apply. I strongly encourage you both to try kit building, and never to be afraid to open up a model and see how it goes together. It seems that the ability to actually build things is fast being lost as more people move toward a consumer and virtual culture. I believe that having some practical mechanical skills is a very good thing, and I am frequently grateful that my father took the time to teach me how to work with my hands as well as with my head.