Lots of info here on Pins vs Ball Locks. Seems the consensus is to each their own. Pin Locks are fine if that's what you can get and your budget can afford.
In regards to a good deal, people will always find steals and post about their awesome deal. I'm thinking in general $150-$225 is pretty common for a basic setup into kegging. You can piece together for a bit cheaper if you can find some deals, and I'm sure there are people that couldn't find any deals to save their life and had to fork up a bit more than the $225. I myself got a deal on my Ball Lock, hoses, picnic tap, co2 bottle (full), and reg for $130. However, I can't find anything even close for more equipment. So, I'd say buy what you can afford and get you into kegging. It's worth it IMHO.