Cobalt is a good choice, they're solid cars for the most part
http://charlotte.craigslist.org/cto/2831921338.html
This altima looks to be in good condition
http://charlotte.craigslist.org/ctd/2831861947.html
Needs exhaust work, but under your budget and pretty comfy.
http://charlotte.craigslist.org/cto/2822929224.html
High miles, but again under your budget
http://charlotte.craigslist.org/cto/2831782175.html