Tossed out the cheap Kimber PJB's for some better Transparent Audio cables and Kimber Heros and it made a difference. Use your best pair for front speakers and a the same single cable for the centre channel. I've been playing with DVD-A through a Marantz 14EX and Kef References all the way around. Interesting on some mixes (Doors LA Women), but can't hold a candle to my Sony SCD1 fueled by Aranov monoblocks.
Many of the DVD-A recordings are so so, that's half the problem. Bass management is also issue, as DVD-A wants to send a full frequency signal to all 5 speakers -- if you've got a wimpy centre and surrounds, you'll not be impressed. And the theory about the bass mangement seems to hold true in real life -- I don't think DVD-A knows how to handle the bass equation properly. I was so dissapointed I bought the Sony SCD-1, and have never looked back from SACD. That said, I find DVD-A fun a times and I will go back when some decenttly mixed stuff is available.