10k Budget - Recommendations

So I decided that my good ol' 93 Grand Cherokee wasn't doing good with the whole 12 MPG thing, and I am looking to buy a vehicle within a few weeks. Here are some of the criteria I am looking for, so if anyone has recommendations, I would love to hear them. I'm mainly looking for a car, but I would consider a crossover if the gas mileage/price is right.

Price: 10K or less
Year: Preferably 2004+, but flexible depending on reliability
Fuel Econ: 22+ city
Other: I need it to be reliable and last five or six years.

So far it looks like these are what I've found, but any thoughts on these or others would be great.

04-5 Mazda 6, 05-06 Chevy Cobalt, 05-06 Pontiac G6