I wish I would have gone to an Extreme Thing back when The Higher or The Cab played. I don't know most of these artists, and I've never been to Extreme Thing. Not worth 20 bucks.
Bite of Las Vegas is always good. Matchbox Twenty, Phillip Phillips, and Ed Sheeran played this year. The Cab and Imagine Dragons played last year. But that's coming from a teenager who loves top 40 radio, which seems uncommon among other teenagers.
I wish Vegas had a festival with more variety, like Lollapalooza or Coachella. Maybe one day.
You may be in luck. I believe Vegas is picking up the Life is Beautiful Festival which should feature the types of bands that you would want to see. First installment is set for fall 2013 I think.