I am planning to buy the 510d instead of the PM 5.1. My problem is that either speakers doesn't come with Dolby Digital or DTS decoders which I need for watching DVD's and Xbox. I am currently using a DTT2500 (original version). Does the Promedia DD-5.1 decoder work non-Klipsch speakers? The Promedia DD-5.1 can decode both DD and DTS and sells for $169.