I've always had good results with White Labs. Make sure to check the expiration date, I think it's only good for about 4 months. Also, keep it in the fridge, then room temp just before pitching. If it gets warm in storage it could kill the yeast, or if pitched in wort that's too hot. If you re-boil to kill the kooties, then pitch healthy yeast I'm sure you'll be fine.