Loca,
Powderfinger are one of the biggest bands in Australia (on a par with Silverchair who also made it into the Top 10). The John Butler Trio are also one of the biggest acts here, although completely different to Powderfinger, stylistically. Powderfinger write great, anthemic rock along the lines of Pearl Jam while John Butler is more roots and blues based. Both are great at what they do, though.
Knowing some of your likes, I think you'd really go for The Good, The Bad & The Queen for chilling sounds and The Bumblebeez to get your energy levels peaking. if you do get to listen to any of my selections, let me know what you think.