Try one of Chris VH's Pulsar's. It is a very solid cable for the money involved and would be an excellent starting point. You may never feel the need to go any further, but if you do, you won't be out much money at all and you'll never regret the small investment that you made in the Pulsar. I don't know of too many other digital cables that you can buy for $80 - $90 and say that about.
$80 will get you the standard 1 meter Pulsar and $90 buys the cryo'd version. It is a much better cable than many of the other digital cables that i've tried at many times the price. The Pulsar actually pounds on many of the cables that i've read that reviewers use as their reference.
Not to belittle Yioryos suggestion of the D-60, but i've had both the Pulsar and the D-60. The D-60 sounds lean, brittle and lifeless compared to the Pulsar, even after the D-60 has been THOROUGHLY "cooked" on my burner. To me, the D-60 has all of the traits of what a "bad" silver cable sounds like, even after hundreds upon hundreds of hours of use.
This is NOT to say that i think that the Pulsar is the best that money can buy, but that i think that it is an astounding bargain for what you get. Given that the D-60 typically sells used for twice the price of what you can buy the Pulsar for brand new, and the D-60 isn't even close to being sonic competition for the Pulsar, that should tell you something. Sean
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PS... This is just my opinion, so take it for what it is worth.