I've had my Sony a33 for a while now and realized I need to use it more often. I already have a 35mm lens for my camera and was wondering what other lenses are best for the Sony DSLR. My budget is around $500. I know the 35mm lens is great for portraits but I'm willing to look into another portrait lens if it's better than the 35mm. I also want to shoot landscapes and nice views, including night time shooting. Please send out your recommendations. Thank you.