Need advice on speaker cables

Take some Nordost flat cable, fold it in half, cut the price by 80% and there you have...Goertz MI2. Best kept secret in audio.

I should have mentioned, in case you aren't already aware, that the Goertz cables are likely to require a Zobel network(if not, install them anyway; they won't hurt anything.) They are included with the cables, but be sure to ask for them specifically.

Rather than reinvent the wheel, I'll point you to your answer: "A friend told me that this cable can cause amplifier instability; is this true?".

The Zobel AlphaCore supplies is a simple heat-shrunk RC network just a bit longer than the span between your binding posts. (Look here for Merlin's 'how to' diagram to get an idea of what we're talking about.}

You can attach them easily with your choice of methods:

stick the leads through the holes in your binding posts(if your cables are terminated with bananas.)

attach them directly to the spades with a dab of solder.

solder/crimp on a pair of bananas and plug them in.

if you're adventurous, you could build your own tweaky network using better quality caps and non-inductive wire wound resistors, open up your cabinets and install them directly at the inputs of your crossover board.

Don't let this simple procedure scare you off. It isn't brain surgery by any means. Anyone can do it.