my daughter is in dance. it is extremely important to her, and i wish to capture it. what i have used for this so far is my Canon XTI with a 18-55mm 3.5-5.6( mostly at 55mm) lens and my 100mm 2.8 Macro lens. i must boost my ISO up to 800 to get the shots with the available light, but i am unhappy with the outcome. either the shot is blurred from movement, poorly detailed, or if i boost it to 1600ISO it is grainy. every store i go to has a different opinion. so i thought i would post my options here and ask you for your help. upgrade to a Canon 50D (higer megapixles) upgrade to a prime 85mm 1.8 upgrade to a 70-200 4.0 IS lens the option of getting the 70-200 lens, would make the purchase of this item not only for dance, but i would be able to use it in other areas of shooting as well. as long as it will perform well as intended too. thank you in advance!!