I have both the Silver Poison and the Silver Widow.
You can use the 8-wire or 4-wire Silver Poison to save some money. They work great with the LCD2, improving transient, tightening the bass and expanding the soundstage, and most important of all, lifting that dark caramel coating.
For the ultimate cable (e.g. with the LCD3), try the 8-wire Silver Widow with silver-pin XLR.
The improvement of the Silver Poison over the stock cable is significant (say from 90 to 95%). There is a smaller difference in going from the Silver Poison to the 8-wire Silver Widow with silver-pin XLR (say from 95 to 97%) for nearly twice the price but that is normal. You have passed the point of diminishing return long ago when you bought the LCD2 so a small improvement in cable or amp will typically double or triple the price each time.
For example, you could be very happy pairing the LCD2 with the Vioelectric 200 or the Schiit Mjolnir amp (for about $1,000) but to get noticeable improvement in the sound, you may need the Bakoon HA-21 ($2,900) or the HeadAmp GS-X Mk2 ($3,000). For a killer bass you may have to go to the Woo WA5 with upgrade parts and tubes (around $4,500). It is the same with cables but the reverse is not always true. Price alone does not guaranty quality or improvement because it is a matter of matching your cans to the cable and amp.
Do your research carefully.
That is the reason why I think Frank's cables are the best "bargains" in this business. And I use the word carefully.