I probably wouldn't pick up the DCX-3400 if I were you. DCX3510 has the new HD guide and since the updates to the client code are pushed by Shaw you are likely to get patches for speed issues fairly quickly (month-ish depending on their release cycle). DCX-3400 is on the older Moto style guide and it's debatable whether it'll ever get the newer guide system at all. Not sure if Moto even still actively updates the code for that.
Basically with the 3400 you'll likely be stuck on last gen's hardware and software. 3510s while they have issues now, will probably be fixed.
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