Hi Lookus, I'm not fully up on the specs for the DBK21 but from what I've read about them they are a dedicated planetary camera and would definitely run circles around the LPI.
If you are going to do dedicated planetary imaging it would definitely be a better buy.
You may want to start another thread regarding the DBK as I know there a quite a few members who use them and could offer some invaluable input to aid you in your decision.
Cheers
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