I think the best "value/price/utility" zoom lens is the 70mm-300mm f/4.5~5.6 VR-II lens, made by Nikon. It goes from a 70mm telephoto to a 300mm telephoto, and if you buy it refurbished, it can be had VERY affordably; last month, Nikon sold some direct in their Memorial Weekend sale on-line for $269.99. NEW, at full-bore, list price at a high-priced walk-in shop it's still $589, but used prices are about $350 or so. I own one, and it's pretty decent. It's what most "regular people", and the testers at DxO Mark are now calling a wildlife lens. DxO Mark is a web site that has tests of the best "wildlife lenses", and this smallish Nikon lens is one of the best choices. It has the inside-the-lens ultrasonic focusing motor that the D3100 and D3200 NEED ((literally, they NEED this!) to autofocus, so, as I see it, that is "the" lens you want. I enjoy mine, and think it is actually up to the task of a 24MP sensor, like the one the D3200 has. In terms of price, I would definitely buy this lens USED--definitely, go for a used one! Many people bought these lenses, and then when they upgraded to the D800, they sold them as they upgraded lenses to the $2400 70-200 V-II model.