Monster cables are great. For adaptors, switchcraft have long been respected for their quality.
But I'm dirt poor so I usually buy Radio Shack. Not very reliable.
From what I hear from some extremely gear/recording savvy friends, the verdict is still out on Monster cables. For one, they've got so many different kinds of the same cable (keyboard cables, guitar cables, bass cables, studio) that are all designed for different purposes. These cables are *supposedly* designed to optimize the transmission of certain frequencies.
Many people argue this is undesirable, and that your cable should be as neutral as possible. Monster cable has also come under fire for its high prices. I think there's a pretty good consensus that there are equal quality cables at a much more reasonable price.
This being said, Monster cables are extremely durable. Unlike cheap cables, you will almost certainly never have to replace them.
Some people swear by Neutrik connectors, but I've found them to be flimsy. I'd take a Switchcraft XLR over a Neutrik any day.
As for RCA and 1/4", I've had good luck with Hosa cables. The important thing with cables and connectors is not only how durable they are, but how well they hold their connection. Beware of budget connectors and cables.