Building first 2 channel system, need cable advice

No - there is absolutely no difference as to an inexpensive cable and an expensive cable. If you are using shielded cables the only thing important is that the shield envelopes the conductors - foil is generally a better way to achieve this than braid but should not add anything to the cost. You can build your own cables. A decent seller of this stuff without the hype and ripoff is Blue Jean Cable. As to speaker wire - blind a/b tests demonstrate that no one can tell the difference between different speaker wire - My choice would be something large such as #12, just to lessen I squared R drops but even this is overkill. Of course I am making the assumption that you are using less than 100 ft runs to each speaker, if you are running the wire out to speakers in the barn, 1000 ft away, then it pays to look at t-line effects. As to spending more for biwiring - this is better termed buywiring - there is no benefit to that practice. Don't fall into the wasteful habit of buying into snake oil. There are plenty of places to spend money in this hobby, put the money where it matters - speakers by far the most important, followed by amps, with preamps a distant third and sources way down the line, and of course one can always purchase more music.