^^^What rocket said. The 2011 Cobalt is called the Cruze. Basically left over Saturn Ion bodies with new front and rear end "sheet metal", and reworked interior.
That more describes the cobalt. Cruze shares nothing significant with the ion. It's a much more sedate car, nicer interior, quieter, smoother, better mileage, but not the same driving experience ( heavier, live rear axle instead of semi independent, less power)
2012 Focus is probably your best for replacing a balt. Independent rear suspension + 160 hp.