What guage hook up wire would be the best?

So cold we forget how to spell.

Aren't there specific guages suggested with the RCA pickups?? I might also be concerned with the type wire you are buying I would think someone would know which applications the wire is used for if you are buying from a site the specializes in DIY.
There is also a DIY board on Audio Asylum I am sure they will help.

Vh audio is a great diy site. Their silver is around a 26awg with an easy to remove teflon foam. I am considering that for my quickie preamp wire upgrade. I like silver plated copper but in that size, removal of the teflon is difficult without wire damage.

An especially good place to shop for interconnect wire & much more: ( http://percyaudio.com/Catalog.pdf ) See page 2