Those are pretty good. I used to rely on mxtabs a lot, but lately their tabs have been disappearing because of copyright stuff. So when they don't
work I check the others. They're actually better sites, but mxtabs is pretty easy to navigate (you just click a bunch as opposed to typing lots)
I tell you the best guitar site to go to for loads of cool information. www.guitargeek.com
It's a great site for everything you need to know about guitars. Good forums to. They also have a database of Rigs which is really cool!