I’ll need 8ft), what type of Signal Cable should I look at in terms of having enough shielding?
You can order RCA to RCA Phono
Or DIN to RCA Phono
All phono cables are shielded, i gave you the link to the Phono (Shielded) cables only: http://signalcable.com/silverresolutionphono.html
You can ask Frank about everything, he used to post on audiogon too, i think the difference is capacitance of the cable if the length is longer. The standard for phono cables is 1 - 1.2 meters, some people use shorter, some people use longer. You are not asking for extremely long cable, but just a bit longer than standard. If you need 6ft it’s about 1.8 m., so i think it is not a problem. If you use MM cartridge you can summarise the capacitance of all the cables from the cartridge pit to phono preamp, then you can look for the recommended capacitance in the documents for your cartridge (MM). But anyway all good phono cables are low capacitance, you can ask the manufacturer.
If you will search audiogon about Signal Cable Silver Resolution you will find some nice feedbacks. I’m sure it will be hard to find anything better at this price, but you can find worst cables for much higher price for sure.