I definitely don't recc cheap cables. I only use quality connections in the systems I install.
As far as hearing and seeing a diff...yes I can, provided decent equipment is being used.
I do not, however, suggest spending as much as you can on cables. In many cases these expensive cables can cost thousands of dollars and end up being only marginally better (sometimes even worse!) than their moderately priced cousins.
What I look for in a cable is good shielding (against RF noise, etc) and a solid connector (not molded plastic) To provide good contact, the connection should be firm and slightly difficult to disconnect. This ensures good contact with the conductors and good signal flow.
If a connection is loose at all, you are losing contact and reducing signal integrity.
As long as the connection is solid and the cable is well shielded, you have a reasonable good cable. The IL300 is a decent cable. The Monster standard offers decent shielding, but a poor connector, being relatively loose when connected.
High end cables have a place in High end systems and cables should be matched to components. For the average Joe's system (receiver based) mid line cables should suffice.
For high end systems ($50k +) cables should be auditioned with the electronics they will connect. That is the only way to see how the entire system works together. Any good high end retailer will allow you to audition the cables in your home, on your system, with the option to exchange if you are not happy. I suggest buying 2-3 different models and using process of elimination to find your favorite.
As for my system, I use Monster Video cables, and Kimber PBJ for Audio. This is the combo I liked with my gear.
