Signal Cable -- High End Generic?

Searching the archive, I found some of you seem to think this guy and his company offer straightforward good value.

I have a weird grab bag assortment of cables inluding old MIT interconnects from SCD-1 to preamp, Monster Cable M-1 and M-1000 circa 1986 (Bruce Brissoon designed?)between amp and preamp and speakers, cheap entry level copper Monster cable connecting outboard crossovers to the Tympanis, and recently added the $50 giant yellow extension cord Home Depot tweak when I ran out of length on the speaker wire.

Nonetheless, the system still sounds pretty amazing, although my two complaints would be flat image and still a bit of glare on the top end, even with the tweaky resistors put in line as a treble attenuator.

So I am wondering if I buy Signal Cables:

best interconnects between pre and power amp
matching interconnects for SACD player

and matching

double run speaker cables with their spades and bananas (their copper line, not silver)

and

the signal cable "magic" power cords all around

What would you guess might happen to the glare, image depth and overall sound?

For a few hundred bucks, I guess I cant go too far wrong but would love any suggestions.