I find Quest to be the best for hobby action. There are some others, but a lot of girls on there are out of the state. I believe Nightline is another good one for local girls.
Quest and Nightline are good, LiveLinks is sometimes alright but the "local calling area" for the DFW region stretches all the way out to Abilene so you get allot of hits in places you just wouldnt bother driving to.
It's been awhile, but I think it's free to listen to ads. For live chat or to be able to respond to messages of girls currently online, it's about $50 for 120 minutes, $100 for 300 minutes, and $150 for about 600 minutes. The chatlines sometimes run specials that give "free" minutes, i.e., if you buy 600 minutes, they'll give your 45 free minutes, 300 minutes will get you 30 free minutes, etc.
When you sign up, be aware that automatic re-billing is an option. When your minutes run out, your card will be billed for the same amount that you originally signed up for. It you don't want it, I think you have to speak to customer service.
I would pass on that one, you never know, i saw a girl at studio 1 years ago, she was my favorite provider, i would see her every week, until she left the room and dropped her drivers license out of her bag and found out she was only 16, i put her license on the table and never saw her again.