I am thinking to buy a lens for my sony a330.Right now it has 3.5-5.6/18-55SAM..i m just wondering what kind of lens should i go for?Any suggestion will b highly appreciated!!!!!

WHICH ONE SHOULD I GO FOR AMONG THESE LENSES?

http://store.sony.com/webapp/wcs/stores/servlet/ProductDisplay?catalogId=10551&storeId=10151&langId=-1&productId=8198552921665255561

2. http://store.sony.com/webapp/wcs/stores/servlet/ProductDisplay?catalogId=10551&storeId=10151&langId=-1&productId=8198552921665927769