Last week, when temperatures here were finally reaching a tolerable level of 60+ degrees during the day, my youngest son (we'll call him "Ansel", who is quickly closing in on 6 years old) spent the better part of two days playing outside with sticks, chalk, and rubber bands. Ansel has Nintendo, Legos, a bicycle, trains, tv, and the internet, yet he chose to use his imagination and make due with less. He decided he wanted a fair, so he went about creating a fair in the yard. He segmented the yard into all of the different midway attractions, creating an archery booth, a slingshot booth, a dart booth, and a skee-ball booth. No electronics, just his imagination and some hard work. He was happy. He ran around, played with sticks, and laughed. He made due with what he had available with no infringement on the quality of play.
I hear so many photographers agonizing over how they are going to get the money to upgrade from their D200 to the D300 or the D700. Their equipment becomes a status symbol for them. We've got to keep up with the Jones's. If Nikon or Canon puts out a newer, bigger, faster model, they have to have it or they aren't keeping up with their PPA buddies. First of all, if you can't figure out how to pay for it, it really isn't a wise investment. If you aren't producing enough income to cover the equipment purchase, you have other fish to fry. The argument that a better camera will raise your senior portrait revenue is specious. It won't. Better product and better marketing will increase your senior portrait revenue, neither of which will be aided by a more expensive camera. If you absolutely need to spend more money, spend it on a better lens. This is where you will see the biggest difference in your image quality.
You need the right tool for the right job. Unless you are shooting sports at a higher level than youth rec leagues, you don't need 8 frames per second. What you need to do is improve your timing. Blasting around the t-ball field shooting 8 frames per second is just embarrassing. None of the 5 year-olds are moving that fast. No high school senior moves that quickly either.
Unless you are consistently printing significantly bigger than 8x10, you don't need 12 mp. What you need is to learn how to handle your exposures properly so that you can get the best out of the camera that you have. I spent a long time printing 12" x 18" with a 6 mp D50 and unless you are 8 inches away or examining the print with a loupe, you can't tell the difference between the print from the D50 and the 10 mp D200. And let's face it, no real viewers examine prints to that extreme.
Please folks, stop falling prey to the equipment bug. Study the craft. Better equipment never equals better talent.