PA system question

[better dylan]

I'm doing stand up these days and would like a set up that i could bring into bars that don't already have some sort of set up. sadly my knowledge only extends to "well it's just a guy with a mic so it's not as complicated as a band playing."

I figure there are plenty of artists here that could weigh in on this. The questions I have are:

What's a good small set up for a bar that would hold 30 to 150 people?
What would I need to also be able to play music from an ipod thru the speakers?
About how much money am I looking at spending on this?
Is there any thing I should be wary of if i were to go thru craiglist?

Thanks guys