How to figure out what kind of camera i need?

I'm looking to get a Nikon, but there are so many models, and i'm on a bit of a budget. I want to take photos of wildlife, my aquarium and plants. I'm thinking i will need to choose a lens as well. What do you use? How much did it cost?

I have a fujifilm finepix s4200, it was less then 200, it works great, the pictures are wonderful and it comes with a lot of settings that are just great. You don't need to get a lens for this camera. I was on a budget and i got this and it works, (: or try looking at some kodak camera!

Http://digital-photography-school.com/how-to-choose-the-right-digital-camera-for-you

The Fuji Finepix S4200 will deliver great quality. Fuji offers the best value for the money. If money is no object go Nikon.