I love a nice sweater. My favorite stores to get them are The Limited, NY and CO, and Express.
I wear all types of sweaters but my favorite is one I got at Express. It's a plum v-neck, very fitted around the waist but with somewhat loose puffy sleeves that taper off at the forearms. Cute and sexy. Looks great with jeans or dressier pants or a skirt too.
I just got a long grey and navy striped cardigan recently and I'll probably be buying a
ribbed flyaway cardigan soon. Those are so cool, make your waist look tiny and you can wear them so many ways.