Which Cables Are of Most Importance?

Rrog,
The point of wire importance is always floating. In my rig the link between amp/preamp is less important than TT --> phonostage.

Power cords by far.

Power Cords by far.

i put a morrow map-3 ac cord [600 bucks with upgraded wattgates] on my 300 dollar emotiva preamp and it has transformed my system. the soundstage is extremely open and pleasing to my ears. i suspect i will be advised i should have just bought a 1000 dollar preamp of some flavor but so it goes in my world.

Article #3 from Cabling Your System on The Audio Beat speaks to this question.