If you're buying a kit from austin homebrew, I'd suggest ditching the canned cooper's kit and buying a better quality kit. They have hundreds and hundreds, and you can make an awesome beer with a good quality kit. Skip the dextrose completely, and the canned pre-hopped extract, and get an extract kit with freshly crushed grain, extract, hops and a good quality yeast (Safale S05 is a good dry yeast). The difference is remarkable in quality and taste!
Broken Leg Brewery
Giving beer a leg to stand on since 2006