Hi Frank,
Cables make a difference: subtle if you're comparing good to better ones; dramatic if you're comparing cheap to good ones. And often the most significant difference is noise rejection, either from "handling" noise but also from lights or "dirty" ac power. There is also tonal differences, but I've found this to exist in really the crappiest of cable. It's about capacitance, and cheesy cable attenuates highs, good cable preserves the signal.
There's lots of hay made about "good"cables, but like many times, these differences can get overblown, hyped, and even lead to seriously costly stuff. But you don't need to break the bank. Mogami makes some of the finest cable out there, is used by pros in recording, and they supply lots of cable makers. There are others, to be sure, but you certainly can't go wrong with mogami. Lots of good cable ends: neutrik and amphenol come immediately to mind. I love the neutrik silent ends (on one end of the cable) as it kills the signal when you unplug, eliminating the "pop" you hear when you unplug the guitar. Again, modest cost for a 12-15' cable and you're good to go. Personally, I'd stay away from "monster" as I personally feel it's more about marketing hype and cost ...but some folks like the fact you can take any monster and trade it for a same new one at any store that is an auth dealer.
Oh, and there's balanced cable that your ES can utilize to offer you a hotter, cleaner signal. But if your marshall cannot accept a balanced input (XLR or TRS end), then it's an irrelevant point. Hope that gives you a bit of guidance
Edward
