SXSW focus has always been up and coming artists. So, it takes a lot of investigating to find shows that you think you might like. Sifting through the website in the weeks before help somewhat. There are always shows by more established artists, as well but you can't count on many that you're familiar with. There also happen to be dozens (hundreds?) of daytime shows that are largely free, but there's no central listing so you learn to be aware of the ones that feature bands you like, and are in venues that are interesting (e.g. back yards of bars, restaurants, parking lots ...).
If you're going for the music, the only pass you need is the Music Badge which is about $800 this year. When I started, it was closer to $500. Still a lot of money, but they were also giving discounts to "alumni".
Anyway, there have been fewer and fewer acts I'm excited to see, which is one reason me and my pals decided to try Big Ears.