Our amps support the balanced standard (AES48). To that end, if your preamp does too, then inexpensive studio balanced line cables will work quite well with very little to be said for exotic cables costing quite a lot more! I use Mogami Neglex at home. If your preamp does not support the standard then you may find that you have some auditioning ahead of you trying to sort out what works with your source.
Heavier gauge is useful for speaker cables- the lower the impedance of the load, the more important this becomes (this being an advantage of higher impedance speakers BTW). But for interconnect cables its not needed and might be a hindrance since it might cause capacitive issues which some preamps or sources might not like.