nikon d5100 zoom lens, or buy new camera?

I bought a nikon d5100 last year. I was looking to buy a good zoom lens for it, but there so expensive. So now i saw the nikon p510 kit, that has a 42x zoom for only 299.99 or the nikon l810 kit with 26x zoom for 199.99.  What do you think me best choose. I own the nikon 18-55mm lens and the nikon 35mm lens that i use for wrestling pictures. My son is in baseball, wrestling, and football. My daughter is in dance and cheerleading. So i want something for all these but not for to much money.